Believe me when I say this: Buying the parts separately is cheaper and they have a higher quality. The parts in most prebuilt gaming PCs are mostly cheap crap marked up for WAY more then what they're worth. For a good build (as in one that can run Crysis 3) Here's what you would want.
An Intel Core i5-3550k processor/ AMD FX-8350 (AMD is cheaper and has more power, but alot more prone to overheating. Reccomend water cooling. Intel is more stable, but more expensive
An nVDIA GTX 570HD/ AMD Raedon 7850 Graphics card (Again, AMD will be more powerful, but prone to overheating and nVDIA will be the more stable one)
Motherboards are mostly free reign, so are BD/DVD drives, Harddrives and cases. I reccomend ASUS hardware. If you plan to SLI/Crossfire, you must get a motherboard that can handle 2 graphics cards
8+ GB of RAM- Preferably Coarsair Vengeance but any will do
Windows 7 64-bit
This should fall in your budget
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Ok, thanks.