The Wii is awesome. Mine is actually loaned out as I am out of town and a friend asked to take it home for the week. The Xbox 360 is not going to get that type of response.
Peaches get a bunch of friends over, booze and the Wii. It rocks! True gamers will whine but they are not the type to leave the house and go to a party so the risk is limited.
And don't even ask about strip bowling.....