Here's the reasoning I bought a PS3 over the 360: At the time, it was in the news that Microsoft extended the warranty of the 360 due to the RRoD. The very fact that you even THINK about the warranty on a game console is a VERY bad thing.
Find a PS3 that's backwards compatible, as hard as they are to find, get as many great PS2 games you can find and download as many great PS1 games. If that fails, just get a cheaper one. And get a Wii as well. The great games are few, but they are REALLY worth it, and the Virtual Console is the best retro gaming download service on the market, and you'll get a lot of milage out of it. Plus, you'll still have the PC, which will be your main system.
PS3, Wii and PC is the best combination of systems to get.