It just depends on what games you want. I've been enjoying Oblivion on my PC for over a year, and the mods make it a far better game than the console versions. The only game out for the PS3 for the whole year that I want is Armored Core 4, since both UT3 and Medal of Honor : Airborne are both coming to PC as well (and I won't play shooters on a gamepad).
Nobody is crazy enough to accuse me of being sane.