kram, I have bad luck when deciding to upgrade. Everytime I do, the next thing comes out and all the new games require it. I've had my Ti 4200 for only about 10 months now and already there's a game out that it's not up to (Far Cry) and soon to be more (Half Life 2).
What makes you think that the 9800 pro will be good for at least 3 years?
By the way, when did the 9800 series come out?