I just got back from the tire place. It turns that their wheel balancer wasn't calibrated and all four of my new tires were completely off. The car is WAY better right now. I'm still getting used to it, because since I had the car it has had this problem.

As far as the brakes are concerned, I'm probably going with the groupbuy. Anyone have any experience with the groupbuy brakes? Also, do I need an alignment now that I got four new tires? I know CLpower started a thread about aligning with new tires....

Anyways, thanks to everyone who helped out.