There are plenty of good options under $2k just use amazon bro:
https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=laptop+144hz
I would definitely recommend asus and sager/clevo/eluktronics
But at the same time I would recommend doing what other people are saying. If you have $2000 to spend you could also find a nice 144hz laptop deal on ebay/amazon and then spend the remaining $800 on a decent prebuild if you're not extremely tech-savvy. Just make sure you talk to setsul if you do.