Already having a good enough PC atm (planning to upgrade to said 1337 status before fallout 3, and yes im so very disappointed but not surprised), and already owning a Wii I plan to purchase a ps3 in the near future. This near future being the release of MGS 4. I definately have a bias for Sony over microsoft, and I really only use my Wii when other people are over (thats kinda an iffy statement.. :juvenile giggle
In the end the Wii will fail because of its sub-par graphics, as todays market is all about graphics over gameplay. The ps3 will win because it will. All hail sony. All hail the cellprocessor godzilla. This said, I will always play a game available for both pc and consoles on my pc. PC is king, long live PC, down with the evil godzilla. Um, yea.