I swapped for the same reasons about a month ago. The online experience with the PS3 sucks compared to the XBOX, I'd rather pay for the quality of the service, than get a sub-standard one for free – although it sounds like that's not a priority.
I buy most games second hand, and there's a LOT less choice on the PS3. Cross platform games I've seen so far are probably a bit better on the 360, but those written just for the PS3 are fantastic (Metal Gear Solid springs to mind).
The PS3'sa lot quieter in use, the controllers are better, the Bluray is really good if you like your movies and it generally feels a bit more grown up (I am prepared to accept the irony in that statement).