I'd reckon a pretty simple heatsink like the U12P or the good ol' TRU120E rev. C with a good fan that pushes 60~70CFM. My TRU120E Black is not so 'Black' anymore thanks to the awesome humid weather all round the year, it has flaked on the fan side and at least there has not been a difference in the performance. Have asked for a LGA1156 bolt-thru kit. 
