Most PC's that you get as a bundle, have components that are not always the top quality components. If you pick your own parts and look for some good deals you can get a better machine.. See my previous post here.
ok, well i have purchased all the parts from newegg.ca it was about 1200$ for the amd X4 phenom black edition, foxcon mobo, GeForce 260 GFX card, a sick case, 750w power supply, 500gig hard drive and what ever else i was suppose to buy
Build your own, it's awesome to do price research, compare and find the best components and put them together.