Well I own 360, PS3, DSL and just about gaming quality PC. So obviously I would want another 360 just incase the one I have craps out (I do think the DVD drive is going).
I not keen on the Wii games library but I would like the supreme ability it has to draw in non gamers to give it ago, just to play more with my friends and family who will not touch the PS3 or 360 with a barge poll.