Not much different in price if you have a computer already that's semi recent and has PCI-E ports. Most of which have them these days, even the cheap ones.
If you don't mind waiting a few days, you can upgrade a pc to play ARR quite cheaply if you use online retailers, and do a bit of shopping around.
Edit: I'm not trying to sway anyone, one way or another. I just think you all should weigh your options, parts vs ps3, then decide. Can't hurt to look around first, especially if you're just sitting around the forums trying to figure out what to do.
I'll gladly help anyone who wants look for parts if they want, that are decent for a decent price. Just an offer. Have at ye'.