New gaming comp

[Naerron]

Hello, lately my fiancé has to use my laptop for school and work so much it's really cutting into my gaming time. So i decided since my laptop really isn't the best I would invest in a desktop for gaming. I play p99 as well as other emu servers and guild wars 2 and a few other newer games. On my laptop it's always lowest graphics settings, and I am hoping to change that. So what I am asking here is some advice. 400 is about what I want to spend but I want a computer that I can run at least mid level graphics on and have no FPS issues. Craigslist has a ton of old desktops for cheap in my area (seattle) so if anyone can just line me out with some stats to shoot for id appreciate it.