i suggest you either pick up a NH-D14 or a Venomous-X for about 4k. The TIM that comes with these two HSF are good and you shouldnt require any other.
But you can save some cash and also get very good cooling performance by going with the cogage True Spirit at around 2k only. Its only for LGA1366 so you will have no problems installing ie you wouldnt need any additional mounting brackets. I would suggest you to get a couple of good scythe flex 12cm fans in push/pull config to go with the true. By default thermalright bundles the TG-2 TIM with the True and it is completely crap. I suggest you look into either of these:- Noctua HT-1, Tuniq TX-3, Arctic MX-2 & OCZ freeze. All of these TIMs will set you back by roughly 500-600 bucks.
Happy OCing.