PS3 got a good lineup coming up.
I had a hard time choosing too and I chose the 360 first and I regret it. I got my PS3 and I am glad!
My friend also got a 360 but he does't want to go on xboxlive anyway.... PS3 is a good all round and got more choice of other type of game if you ask me.
Also, I disagree with selling the wii. If you need the money to actually buy your new console then that's ok but I find I have more games on my wii then any other console. I actually play many gamecube games on my wii and the virtual console is nice. Also, the wii games aren't so bad. Sure, there are not so many title.... but 3rd party devellopers seems to have understand that if they want to make money on the wii....they gotta work harder. Also, as you said.... the wii is more axed on multiplayer but it features great single player title.
I see the wii as a nostalgia console..... to play pas games (ports, vc, gamecube) and some cool new games (Mario, Brawl, Kart, Zelda, Paper mario, Okami, FE, Mario strikers). I actually never bought a mni game title on the wii (like raving rabbits) and I am happy without it.... those kind of games are good in small doses..... and 3rd party company seems to have forget that.