In the end if you have enough money to blow on a monitor:
http://shop.benq.us/ProductDetail.aspx?id=347

That's amazing ^

Build your own, its easy and will be a lot cheaper.
If you need any help the guys at www.reddit.com/r/buildapc are very helpful and can help you with any questions you might have

Personally, this is what I would choose but it's all up for debate. Do some research on your own and see what conclusions you draw

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($169.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ Amazon)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard ($129.99 @ Amazon)
Memory: Corsair Vengeance LP 16GB (2 x 8GB) DDR3-1600 Memory ($73.99 @ Newegg)
Storage: Crucial M4 64GB 2.5" Solid State Disk ($66.48 @ Amazon)
Storage: Samsung Spinpoint F3 1TB 3.5" 7200RPM Internal Hard Drive ($88.98 @ Newegg)
Video Card: Asus GeForce GTX 660 Ti 2GB Video Card ($297.86 @ Newegg)
Case: Cooler Master CM 690 II (Black) ATX Mid Tower Case ($75.12 @ NCIX US)
Power Supply: Corsair Professional 750W 80 PLUS Silver Certified ATX12V / EPS12V Power Supply ($104.99 @ Newegg)
Monitor: BenQ XL2420T 120Hz 24.0" Monitor ($389.99 @ Newegg)
Mouse: Logitech G400 Wired Optical Mouse ($29.99 @ Amazon)
Total: $1502.36
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-12-13 21:58 EST-0500)

whatever you do dont try to cheap out on a power supply, trust me, i had to learn the hard way, computer shuts off, a fucking lightning bolt occurs at my psu, freaked the shit out of me, and i lost a 5 page chemistry paper

Take the Asus VG236H 120hz monitor into consideration:
http://wecravegamestoo.com/forums/gadgetry-electronics-discussion/9014-asus-vg236h-120hz-3d-monitor-review.html

The dude also did a review on the BenQ XL2420T, too:
http://wecravegamestoo.com/forums/gadgetry-electronics-discussion/10706-benq-xl2420t-120hz-3d-monitor-review.html

The asus monitor has higher color accuracy and has identical input lag, in comparison to the benq.

http://images2.wikia.nocookie.net/__cb20120513143331/4changboard/images/b/bd/Falconguide.png

Useful information contained above, SFW

whyyy is south-america so expensive :(

A few things from my build(around $1300) 2 months ago:

75$ case, 3 fans, easy installation
newegg.com/Product/Product.aspx?Item=N82E16811517012

$135 The cheapest motherboard to get with a higher end processor. No SLI
newegg.com/Product/Product.aspx?Item=N82E16813131834

$250 GTX 570 Graphics Card, highest end GPU while still getting great bang for buck
newegg.com/Product/Product.aspx?Item=N82E16814130593

$140 Power Supply, was on sale, for this setup you want at least 600 Watts
newegg.com/Product/Product.aspx?Item=N82E16817116016

$215 Processor, similar to GPU: not the very best but a good deal
newegg.com/Product/Product.aspx?Item=N82E16819115233

$105 Solid State Drive, was on sale, more than enough space for an SSD
newegg.com/Product/Product.aspx?Item=N82E16820226236

$65 Standard Hard Drive to keep everything else
newegg.com/Product/Product.aspx?Item=N82E16822136769

$170 Monitor, was on sale, only 60 Hz: possibly the only thing to improve
newegg.com/Product/Product.aspx?Item=N82E16824236059

$30 Fan
newegg.com/Product/Product.aspx?Item=N82E16835103065

There are other parts I didn't mention. The best online resources include:
reddit.com/r/buildapc
cpubenchmark.net
How to buld a PC series: youtube.com/playlist?list=PLB029F381E29C6002

This build is great, but the video card is a poor choice. MSI 660ti power edition is the GPU of choice for anybody building a single card machine right now. It out performs the 670 SC and the 680.

Yeah I've just heard the cooler is a great one. I own the EVGA myself so I haven't payed much attention to the other brands but John seems knowledgeable, go with that one.

Don't do this. For $250 you have a lot better options than the 570, it may be a great card, but you can get better bang for you buck elsewhere with a newer card

What these 2 have said, except I would skip the SSD. IMO, an SSD is not worth it if I can't fit Windows AND ALL of my programs on it.

Both preform almost exactly the same.

http://images.hardwarecanucks.com/image//skymtl/GPU/GTX-660-ROUNDUP/GTX-660-ROUNDUP-41.jpg

http://images.hardwarecanucks.com/image//skymtl/GPU/GTX-660-ROUNDUP/GTX-660-ROUNDUP-37.jpg

http://images.hardwarecanucks.com/image//skymtl/GPU/GTX-660-ROUNDUP/GTX-660-ROUNDUP-54.jpg

Overclocking:

http://images.hardwarecanucks.com/image//skymtl/GPU/GTX-660-ROUNDUP/GTX-660-ROUNDUP-84.jpg

Just get the one that is cheapest.

MSI's PE 660ti is a great choice but in no way shape or form can it possibly outperform a 670 or 680. The 660ti's possibly higher clock speed from OC doesn't mean much.
An OC'd 660ti only goes to par with a stock 670's performance (maybe slightly better if you get a good OC without POST problems), but it gets instantly crushed by an OC'd 670, and any 680 will completely destroy the 660ti's performance. Especially factoring in MSI's 670 power edition and Lightning edition 680.

I would definitely get an SSD, even if it required a slight downgrade on something else. I built a new computer recently and having an SSD was by far the most noticeable upgrade. 64 GB is ridiculously small though, you can get 120 GB for a little over $100.

Just my opinion though.

Yeah that's what I meant, if you're gonna get an SSD you really should go 120/128 or higher.

With lazy panda's build, could someone tell me how much FPS they run with that?

i would not buy an expensive build for just tf2.. like 600 max for just tf2 i would say lol

Not just tf2. Also, I asked how much FPS one gets, not buying advice, although thanks for the comment.

It depends on what config you run

Let's say no config vs maxframes.

you dont need 750w unless you plan to sli in the future

Well no config max settings you can get between 200-300 fps depending on what is happening in the game at that time. Sometimes your fps will drop down into the 100s but almost never dips below 120. With maxframes you can get rougly 300-400 fps with the frame rate occasionally but rarely dropping into the 240s or 250s during very heavy graphic things. This is during 6v6 gameplay, playing on pub servers will cause your fps to be lower than this