To be honest, I have to agree that buying a GTS 250 to SLI with your 9800 GTX+ would be your best path right now. The performance increase with a GTX 200 series card would be noticeable but it's not really gonna wow ya. As far as Fermi, those cards wont be out until March & they are gonna be expensive. In order to see an improvement over what you already have, you're not going to be able to get one of the cheaper cards that come out. At the very least, you're going to have to buy an upper mid range card to see any real improvement & since they are going to be new, they will cost quite a bit.