EDIT:
All right, filling this out again, as I'm getting closer to finalizing the build!
Basic Desktop Questions:
Budget: ~$700 (but the more I can hit that "sweet spot" between price and performance the better). USA
Main Use: Gaming, possibly emulation
Monitor Resolution: 1680x1050 for now. Possibly 1920x1080 in the future. Don't think I'll go higher than that.
List SPECIFIC games that you MUST be able to play: Nothing too crazy, but I'd like it to be able to handle things coming out in the future decently. I don't need Ultra settings on everything, but a system with enough life in it to handle things decently for a few years is preferred. I'd like to play Crysis, for example, and some games that I got from the Steam sale (Just Cause 2, Darksiders, Batman: AA, Fallout: New Vegas). Deus Ex: HR in the near future.
Are reusing any parts?: Yes. I'm reusing the case (possibly -- unless I find a good deal on a new one), optical drive, and HDD. The HDD is one I got recently, and is fine. May upgrade to an SSD as well in the future, but that won't be for some time.
When will you build?: Depends. Maybe in the next couple of weeks.
Will you be overclocking?: Yes.
I've already bought RAM for this build. Here's what I've put together so far:
Little wary about the mobo and the PSU. I've heard recommendations both ways, but I keep coming back to that PSU. Seems like the best deal for the price, and it should handle an OC'ed i5 2500k no problem, from what I've heard.