Best air cooler: Noctua NH-D14, Bequiet Drak Rock Pro 2, Phanteks PH-TC14PE
Best All in one liquid cooler, Corsiar H100i, H110i (140mm version of the H100i), Swiftech H220
Best of the best, custom water loop
Top air coolers like NH-D14 compares to H100i (within 1-2C difference) and are generally cheaper but can interfer with ram sticks or in some rare case, VRM heatsinks and/or cases (not enough width to install them)