PS3 = $600
Wii60 Combo = $650
For $50 dollars more, you get a system that is basically the same thing as a PS3, and the Wii, which has to be played to be believed, I am getting a Wii for xmas, and love my 360.
PS3 online is free, but don't think for one second that it is anywhere near as good as Xbox Live. Sure you have a friends list with PS3, but it's a different friends list for every game you play, you can't message friends playing a different game, and you can't join a game that a friend is playing. I'd rather pay the 50 a year and get the much better online service.
Also, the 360 just dropped HELLA movies and TV shows on the Video Marketplace a couple days ago, as far as I know, you can't do any of that shit on PS3.
The Wii honestly is more of a secondary console, most people will have a 360 or PS3, and a Wii.