Yeah, I know you want links, its easier if you research and post 3 or 4 options and I can tell you what one is the best for you because its hard just to find s***, and really really time consuming. I might look later if I'm bored.
Damn. Nice spending limit. Basically you want a fast computer, with a fast processor, and memory, what games? WoW kind of games or like browser games/a few PC games?
I cab try and help you, but I'd suggest around a 22" monitor for like $200 or so, get a nice one, because you'll be looking at...