One thing that I'm not sure if anyone has mentioned - PS3 games tend to drop in price a bit quicker than the 360. For example, I've seen the same game for £10 cheaper, just because its on the PS3. Also, controllers and peripherals are cheaper, because they don't have that controller tech cost (M$ charge people to use their controller tech).
If it's a case of loosing the 360, then I say go for it. I have all the consoles, and the PS3 easily gets the most attention. It's not really because of exclusives or anything like that, it just seems to be a good all round console, and I kinda wish I had bought more games for that, rather than the 360. LBP is a great game, I really like the community levels, like the shark attack and bomb survival stuff - a lot of fun. There are some great shooters too, like Killzone 2 and 3, and MAG is well worth checking out too, if you fancy some bigger online matches. XBL can be a pain in the arse, I honestly find that there are less griefers and idiots on the PS3 than the 360.
As for people saying a PC makes more sense... well it depends on your perspective. If your a gamer, and you don't have a console, then stop calling yourself a gamer!. Being a PC gamer doesn't count, because everybody I know can call themselves a PC gamer. People should choose to play on PC rather than a console because the experience is better on the PC. That might often be the case, but it's not set in stone - there are a lot of games out there that aren't designed for PC, aren't released for PC, and simply aren't as good on PC. It's good to sit on a couch and play games on a large screen, it's not a sign of weakness FFS!. Gamers should be prepared to play on whatever platform is available, or convenient, whether that's a top range gaming PC, a PS3, or a freakin Vectrex! Consoles level the playing field and leave it up to the players skill - most of the time at least.