Firstly I'm not trying to put you off the card, as it is currently the fatest card,(in DDR form), you can buy, but for those that are not aware yet there are some motherboards that will not work with the geforce. There are some that can be modifyed to use it and there are problems with the Athlon boards an power supplies. and many other issues. Even if you are not getting the Creative version most of the faq will apply.
This FAQ is an independant help file that is updated frequently by the author Christopher Hill and includes many tips and info for successfull gaming with a geforce.
Please read it so you know before you buy whether a $300 card may end up costing you more to get it working with your current hardware, espicially the instability section.