So my old computer, which has served me faithfully these past five years, is finally dying. I've upgraded it here and there over time, but so many different parts are dying, outdated, or just plain don't play well with the other parts that I'm just pulling out the RAM and tossing the rest. I could use some advice in buying/assembling a new computer. Is there something I can get for about $800 that can still play most games currently on the market?