wut? Ther are good and bad brands for all the parts in it.
But for me it would be
Case: NZXT, Corsair, or silverstone
CPU: Intel or AMD obviously. I like AMD because its a helluva lot more affordable, as well as practical.
GPU: ATI or nVidia. Same as above, ATI for price and practical use.
Motherboard: Asus, or gigabyte have worked well for me for a long time.
RAM: Corsair Is great, and I want to sat G.Skill, but Ive been having problems with mine lately.
PSU: Corsair again. Silverstone is also good.
Cooling: Xigmatec, or zalman. I am looking at that Corsair self contained water cooling thing too, and it looks tight as hell.
And thats pretty much it.