Congrats on joining Wii ownership!
My thoughts so far have been to use the Wii for family time and games and to get FPS's on either the PS3 or the 360. If I want a game that I can play online with people, I'll buy it on the 360. If it doesn't exist on the 360, I'll get it on the PS3. If it looks like fun for the entire family, I'll get it on the Wii. Dang, I don't want to add it all up, but I think I have all the bases covered! haha.
There seem to be more than few games coming out for the Wii that look like they are going to be fun. I'd say look for those titles!