Thinking of Buying the Kids a game system for Christmas. I have 6 year old twins and thought it was about time to start them since it is all the other kids at school talks about. Knowing my wife they will have limited screen time but after discussing it for months she has agreed that we should take the plundge. So I am looking for advise as to what I should buy. Should I go Wii? Xbox 360? Play station 3? I hear the Wii is on the way out and both xbox and PS3 have been around awhile so is one a better bet?