Do you have space for the Scythe Big Shuriken Rev 2? It's considerably wider, still low-profile and I've been impressed how well it cools an i5-4590. Wouldn't have minded it being another cm lower thoughThe low profile coolers I'm looking at, Cooler Master GeminII M4, Noctua L9i, Zalman CNPS8900, etc (also looking at Prolima Sam-17 which has decent reviews but spreadsheet says is barely better than stock) are rated pretty badly, barely better than stock by a few degrees, so since it is a pretty cramped case I figure whatever can keep it cooler is probably a good bet.