Re: What should I look for?
Intel if it is a Core2Duo or better. If it is a P4, only get it if you want a space heater. Well, they are not that bad, but there is a reason Intel ditched them.
Depending on your budget, an older rig can serve you well. Mine is about three years old, but I have upgraded a few things on it. It is a socket 939 AMD, but I play the new stuff with it. My 3850 is not the top of the line by any means, but I still game with it, too.
It goes by what you can afford. If in doubt, copy and paste the specs here and several will chime in with whether it is worth the money or not.
My Rig: SABLE
Antec 300 Illusion / Antec EarthWatts EA650 650W / EVGA GTX 760 2GB
AMD FX 8320 x8 Black Edition / Gelid Tranquillo / MSI 970A-G43
Sandisk Ultra Plus 128GB / Samsung 840 120GB / WD Black 750GB / WD Green 1TB / WD Red 3TB
G.SKILL Ripjaws 2x2GB DDR3 1600 - Crucial Ballistix Tracer 2x2GB DDR3 1600
Win7 Ult 64-bit - Func MS3 Mouse - CM Storm QuickFire Rapid Mech Keyboard
R.I.P. Danny L. Trotter
... 14 Nov 1945 - 4 Sept 2009