I have both an xbox and a ps3, if you were deadset on picking between the two, I'd say ps3. If you go xbox, that's still not the wrong decision. You're not even picking between apples and oranges; rather between granny smith and golden delicious. Both are awesome, only you know your tastes, and it's not really that important to get it right.

However, SNES + gaming computer means all the best games of today with all the best games of yesterday. Do it.