AFAIK there are 32 bit and 64 bit versions.
I recommend waiting on the video card. The 4850 and 4870 are both suppose to achieve better performance than the 9800 GTX, for alot less, and are due out within the month. The new nvidia card (GT280) is also suppose to deliver better performance, abliet at a higher price.
At the very least these launches will cause a drastic price "re-adjustment" of the 9800 GTX.
Just a quick edit, if your interestedhttp://www.newegg.com/Product/Product.aspx?Item=N82E16811129021&Tpk=Antec%2b900
for $129, the airflow would allow you to overclock that sweet CPU of yours, on air, pretty well.
Of course if its going to be in your bedroom/other living area the LEDs can get annoying.