The computer I use now does alright WoW, I mostly run it on good or high unless I'm in a very crowded area. That said, I'd love to be able to max out settings and enjoy the new graphical updates for MoP, so I've been looking to upgrade.
This is my setup atm (a pre-build setup I bought like 2 years ago):
What should I be looking to upgrade to increase my performance? Should I just get a new setup altogether? I don't have too much money to throw around, and I really only play wow on the computer, so I'd like to keep that as the goal.