CPU Cooler:CRYORIG H7 49.0 CFM CPU Cooler ($30.99 @ Newegg) Total: $30.99 Prices include shipping, taxes, and discounts when available Generated by PCPartPicker 2015-11-16 20:04 EST-0500
http://www.hitechlegion.com/reviews/cooling/heatsinks/42980-cryorig-h7-universal-cpu-cooler-review?showall=&start=3
Review from hitechlegion ^
Unmatched Compatibility
Zero RAM Interference
Focusing on providing the widest range of
compatibility, the H7 utilizes an asymmetric slanted
heatpipe layout to move the heatsink away from the
RAM zone, Offering optimal compatibility for RAM
with tall heat spreaders on both Intel 115X and
AMD platforms.
I'd urge you not to even consider a tower cooler on the pro 3 - you need a down blower style cooler on there plain & simple.
The shuriken is probably the cheapest. http://pcpartpicker.com/search/?cc=us&q=Shuriken