dude, the 9800GTX is NOT a good idea... I highly suggest you cancel that order ASAP for two reasons..
1) Gaming-wise, you'll barely be able to tell the difference from an 8800GTS, even an 8800GT for that matter, save your money, you're just buying an overclocked version of an 8800 with a 9xxx name-change, it's the same G92 core, you really won't see a difference, trust me, the reviews that show 'increased performance' are within margin of error, like 2-4 fps at most at 1600x1200 (don't even bother counting the 1280x1024 results...), considering that the 8800GT is significantly cheaper, your pretty much paying about $25 per FPS with the 9800GTX...
2) GT200 (9900GTX) is just around the corner, July-ish, and will make these things obsolete very quickly, considering that the new GTX is speculated to beat out the 9800GX2..