Urm, nForce2, you installed SP1 right and then installed the drivers on nvidias website for your platform? If you have you shouldn't really need to do anything else... there're though and i'll warn you a fair few issues with USB2 on the nForce2 chipset especially with external drives but i'm sure you'll run into them all in time if you are an avid USB2 user, i'm sure many people have no problems at all but many people do... however it's still being worked on only recently Abit updated one of their nforce2 boards with USB2 compatibility enhancements so maybe Asus will follow suit.
Congrats on your first build
btw.