Some popular CPU coolers around here: CM Hyper 212 EVO (or Plus), Noctua NH-D14, Thermaltake Frio and Thermalright Silver Arrow.
They all fit LGA 1155 motherboards.
- Because of their size, they may interfere with tall RAM heatsinks. On some motherboards, it just blocks the first slot.
- Again because of their size, they may interfere with your case side panel (+ side fans, if any) if your case is not wide enough.
Get the one that fits your budget - all work well and are highly reviewed.