bearodactylIt would help to know a little more about what they are going to be used for (ie what genres of music, amped or not, preference of sound signature etc). For gaming I would recommend open back headphones over closed for the wider soundstage, unless you plan on using them portably (sound leak and no isolation). I also like being able to hear things around me and how loud my voice is but that just comes down to preference.
I listen to a lot of rock and prefer bright headphones so I bought a pair of grado sr80s when I was in your situation. Grados definitely aren't for everybody though and I wouldn't recommend them to you with so little information.
I'm mostly going to use them for gaming but I do listen to music quite often (gorrilaz, two door cinema club, m83, and etc) But my primary concern is comfort, my old ones would hurt my ears and mess up my hair horribly