Ok you first heard from a intel guy
I run three Amd systems all with Corsair water cooling and overclocked.
They are the h55, h80i, and the h110i all set up as exhausting.
Find out what your case can handle then go from there as to radiator / fan specs.
The i in the 2 above coolers stand for the corsair link software.
Fan and pump speeds can be changed from that software on the fly.
As far as cost for those a h55 can be approx $70 us, the h80i approx $80-95 us, h110i -$99 -135us.
My temps stay cool and under Aod stress testing temps stay 44-48c.
Keep an eye on Newegg or if you live here in the us check Microcenter.
Microcenter will price match, but Newegg may not charge tax depending where you live.
Hope this helps