The Hyper 212 Plus is a popular choice, in part because it was one of the few ready to ship when 1156 hit retail. There are other good choices, though you won't necessarily find many reviews with coolers on P55/1156 boards. If you do, please post some links.
One often recommended cooler that has been revised to support 1156 is the Prolimatech Megahalems Rev B. though as with any cooler you'll want to make sure it fits your case and motherboard without encroaching more than you can afford on the RAM or PCIe slots. http://www.frozencpu.com/products/ [...] _Item.html