Actually, Zalmans waterblocks aren't even on the list of any proper, informed setup. Real watercoolers won't touch Zalman.
Now koolance is doing better. I'd never buy one of their 'kits', they are weak junk. But koolance has okay blocks, a okay rad, and even a rebadged laing pump for sale now. Thier 360 CPU block did well in tests.http://www.skinneelabs.com/