Even though I dont like HPs (for many reasons), for that price, it's a deal! If you have major problems with it, eBayers would jump on that hardware like a starving squirrel on the last peanut on Earth. The performance specs are great; I think it should work well for gaming, for the price. What games do you plan on playing on it?
Once you get it, use this site to evaluate before you buy or try the game:
http://www.systemrequirementslab.com/
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Repair Windows XP Guide ---
Resolutions
Crazy Computer that I'm saving up for::Antec P180 Case;PC Pwr&Cooling 1kW Quad SLI PSU;Asus P5N32-SLI SE Deluxe;Intel Core2 XE X6800;Corsair TWIN2XP2048 2GB PC2-6400 DDR2 RAM;2xAsus GeForce 7950 GX2;BFG PhysX Accel.;IBM DVD-RAM/Plextor DVD±RW;Seagate 750GB HD 7200RPM;WDX 150GB 10000RPM;Vigor Monsoon TEC Cooler