CPU Cooler: the 212 is great bang for the buck, but the Scythe Mugen is almost as good as Notcua's ND-H14, and only runs ~$50
I would also suggest a motherboard with at least 3 pci express slots. With 2 cards, you run into a phenomenon called microstuttering. You'll notice an inconsistent framerate, even though the average fps may be at 60. Above that framerate, it's less noticeable, but it may get annoying as your machine ages and the fps of new games you buy start dropping into that range.
No one has seemed to figure out why yet, but microstuttering only happens with 2 cards. 3 or 4 eliminates the problem.