PS3
Pro: If you have lots and lots of money, you can prove you do by running a PS3 at 1080p.
Con: Lack of full-capability-showoff titles compared to cheaper consoles
Xbox 360
Pro: Focused on hardcore shooter games
Con: Focused on hardcore shooter games
Wii
Pro: Will have many exclusives which, if you like Nintendo-style games, are fantastic
Con: Nintendo tends to release games in PAL regions up to a year later for some games (Pokemon) and occasionally 3 years later (Animal Crossing)
Ubuntu. Linux for human beings.
If you are interested in trying Ubuntu or Linux in general, PM me and I will answer your questions and help you install it if you wish.