Judging by the performance of the H60 (only AIO cooler I've owned to date) an H80i would be the best middle ground, price wise, and performance wise. The H60 I have, held an APU 6800K stable @ 5.0Ghz (1.53v) under Prime95 for four hours with a max temp of 63c. Impressive for a slim, single 120mm rad config.
I'm kinda with Majesticii, in that the money seems wasted when there are hidden gems out that that perform just as well, if not better.