Budget wise, the Hyper 212 Evo. Performance wise, the Noctua NH-D14 or Phanteks ph-tc14pe, along with closed loop CPU coolers like the H100i from Corsair, H110, or NZXT Kraken X60 (they will all fit in the NZXT Phantom 820).
If you wanted something that looked decent and small, I suppose this...