Do you have any parts from an old computer you will reuse? Your budget fits the price for a radeon hd 6870 for the graphics card, and as for processor the AMD Phenom x4 960t is pretty good with your budget or the AMD FX 6100, obviously you'll need a mobo to go along with these two processors and i suggest getting a heatsink as well. So, these are the minimums I suggest, according to what you say you already have I'll suggest the rest with links to where you can buy them for the best price (since you said you can buy from Newegg I assume you live in the US or maybe Canada).