With a good computer I'm certainly starting to feel that my PS3 is sorta useless...except for watching blu-ray movies.
For consoles, it's all about the exclusives - and so far the Wii has had more that I've wanted than other consoles. Being of a different hardware configuration, the wii tends to get games that aren't also ported to the PC - and when games are shared with the PC, I will always by them for that platform.