I like ARCTIC COOLING Freezer XTREME because it's massive, has 120mm fan, reasonably priced, and more importantly easy to install. The only problem I see with it is that it has low speed fan(1500 rpm) which doesn't pump out a lot of heat with OCed core i7.
Since the fan is custom fitted/inserted into the heat-sinker, it's hard to replace it with another high rpm fan like 2000 rpm.
I read the review of ARCTIC COOLING Freezer XTREME and they mentioned replacing the fan with high rpm and the results are very comparable to the top of line ThermalRight's one.