Just don't buy branded PC. Assemble them yourself. Branded PC suck. They use to be way overpriced, and of crappy quality...
When I put together mi prior rig, I saved nearly U$S 700 comparing it with the "best" branded rig that could be bought here. And mine had twice the RAM (1GB) and a true video card (6600GT instead of the integrated via unichrome card).
(If you find any mistake in my English, please let me know via a PM)
(Really, I speak terrible English, so please, tell me if I make mistakes. I'd like to improve it a bit )