I have a PS3 as my main console buying pretty much everything for it. 43 Blu-ray movies, (huge movie fan), tons of games for it including the all important PSN titles, such as PixelJunk series, Mega Man 9, etc. etc., and free online. You really can't beat the total package it delivers.
My 360 loves to play its exclusives though, which has some really good ones. (i.e. I love Fable series), Mass Effect, Dead Rising, Gears, etc..
My roommate had a Wii and after 2 months of him and I playing it, we never touched it again, (he sold it to go for a PS3), (yes we played Zelda, Galaxy, Wii Sports etc.) I don't see me ever picking up all 3 because of it.
In conclusion, PS3 makes sense to the rational person to be your main console of choice from this point forward. 360 may have been the primary console of the past (due to its one year head start), but people have realized (or should rationally come to the conclusion) that the PS3, if you have more than one console should be your primary gaming device.