I bought my son a PS2, due to the larger pool of games. The age segment extends to a larger audience with PS2, something that might not matter to you, but my son is in the pre-teen group.

Also, having spent my career in Hi-Tech and IT, I do not like to fund the MS monopoly. But that was not my major reason, the games my son wanted overrode all else! It really is about the kids, and less about me I have found!