Unless you plan to move the Blu-Ray player to another room after you get the PS3, the Blu-Ray player is a waste of money. The wii's not as bad as Sanus made it out to be, though. The casual games on it you can drag out when family comes over, and I love all the gun games on it. The Wii has diminishing returns. You'll play with it a lot at first, then less and less as time goes on. For me, I use the PS3 almost daily for Blu-Rays, and you also get Valkyria Chronicles and the whole Yakuza series, if you have a BC model. I find that the software BC model is just as good as a hardware BC model, so either one of them will play 90% of Ps2 games flawlessly--that's better BC than the 360-- but it takes a lot of research to get the right one, since they all look the same.
I buy most of my games on the 360, because of achievements and My friends don't own PS3's. Trophies do nothing for me, because lots of games don't have them.