Alright. I've got a modest HTPC setup that I built a couple years ago. I've got some money to devote to some basic upgrades for gaming. I'd like to reuse as many parts as possible (Power supply, HDD, Disc Drive, Case, Fans, etc.). My Current Specs:
CPU: AMD Athlon II X2 250
RAM: 2x1G DDR2
Mobo: Gigabyte GA-MA785GM-US2H
GPU: Radeon HD 4550
Power supply: 550W (not sure of brand)
OS: Windows 7 (64 bit)
Display native output resolution: 768p (aka "720p")
Not interested in messing with overclocking (too time consuming for what I want it for). My budget's in the neighborhood of $300-400. I figure I've got two basic routes: I could either just get more memory and a slightly better graphics card. Or I could get a whole new motherboard, processor, and memory (DDR3) along with a new graphics card. Mostly, I'd just like to play some PC-centric titles that I've missed over the past few years (Crysis, Dragon Age, Starcraft 2, The Witcher, etc). Something somewhat future-proof would be nice, but not necessary.
Also, just as important, I do all of my gaming in my living room sitting in a chair or on my couch. So using a standard wireless mouse and keyboard won't cut it for gaming. I know there are various "solutions" out there for lap gaming, but curious what some of you folks might use.