Hey Y2, another consideration might be the ability to playback DVD movies. PS2 does it off the shelf. X box can with an additional add-on. Gamecube can't (hence the difference in price). My kids have the PS2 here at the house and X box and G'cube at the grandparents. They seem to gravitate to the PS2, even when they're over there.
I think with the Xbox, you're seeing the future in convergence of the computer(internet), TV, and gaming consoles. But for now, I'd go with the PS2, as the sports games are as good as anything else out nthere.