Without knowing the exactly what you like, i'd probably go for a pc upgrade. PS3s are still expensive and you can spend time chipping away at your existing backlog while waiting for a substantial ps3 price drop. It's the cheapest option and one that will allow you access to some great upcoming games.
Demon's Souls Official Thread | Currently playing: Left 4 Dead 2, LittleBigPlanet 2, Magicka