I recently had to make the same choice as i wanted a new PC and had to sell one of my consoles (xbox or PS2 - had already sold gamecube).

I choose to stay with the PS2 because most of the games on the Xbox will make an apperance on the PC anway (ie. KOTOR 2).

Although i'm kind of regretting getting rid of it now but as soon as i can save up enough i'll prob get another