2500K heatsink ?

http://benchmarkreviews.com/index.php?option=com_content&task=view&id=447&Itemid=62

Top Performers top 3 are underlined

* Prolimatech Megahalems
* Thermalright Venomous-X RT
* Scythe Mugen 2 SCMG-2100

* ProlimaTech Super Mega
* Cogage Arrow
* ProlimaTech Armageddon
* Thermalright Ultra-120 eXtreme
* Cogage TRUE Spirit
* Xigmatek Balder SD1283
* SilenX Effizio EFZ-120HA4
* Titan FENRIR TTC-NK85TZ

Highly Recommended

* Noctua NH-D14
* Zalman CNPS10X-Performa
* Coolink Corator-DS Heatsink
* CoolAge CA-X120TF Wind Tunnel
* Tuniq Tower 120 Extreme
* Thermolab BARAM
* Xigmatek Thor's Hammer S126384
* Scythe Yasya SCYS-1000 Cooler
* Noctua NH-U12P
* Cooler Master V6 GT Heatsink
* Thermaltake Contac-29 CLP0568
* Zalman CNPS10X-Quiet

http://benchmarkreviews.com/index.php?option=com_content&task=view&id=150&Itemid=62&limit=1&limitstart=13

Listed in order of enthusiast performance results, Benchmark Reviews offers the following products for consideration:

Shin-Etsu MicroSi G751 - Sold at NewEgg under the Masscool brand
Arctic Silver 5 - Sold at FrozenCPU and NewEgg in multiple sizes. Curing time is highly recommended.
Thermaltake Grease A2150 - Arctic Silver 5 sold in Thermatake packaging.
Gelid GC-Extreme - Recently launched and sold at FrozenCPU.
Tuniq TX-3 - Recently launched and sold at FrozenCPU.
TIM Consultants T-C Grease 0099 (Copper) - Mass-production of this material has been postponed.
Shin-Etsu MicroSi X-23 7783D - Sold at FrozenCPU in multiple sizes.
GC Electronics Silcone Z9 10-8108 - Purchase directly from the manufacturers website.
TIM Consultants T-C Grease 0098 - Purchase directly from the manufacturers website.
Cooler Master ThermalFusion 400 RG-TF4-TGU1-GP - Sold at FrozenCPU and NewEgg.
Zalman ZM-STG2 Super Thermal Grease - Included with the CNPS 10X Extreme CPU cooler.
MG Chemicals 860 Silicone HTC - Purchase directly from the manufacturers website.
OCZ Freeze OCZTFRZTC - Sold at NewEgg and other online retailers.
Innovative Cooling Seven Carat Diamond - sold at FrozenCPU.
Coolink Chillaramic - Visit the manufacturers website for more information.
Arctic Cooling MX-2 - Sold at FrozenCPU and NewEgg
Gelid GC-2 TC-GC-02-A - Recently launched and sold at FrozenCPU.
Evercool Cruise Missle STC-03 - Visit the manufacturers website for more information.
Thermaltake CL-O0027 TG1 - Sold at several online retailers.
Zaward HSC-G - Visit the manufacturers website for more information.
 


Good choice for the fact you don't need a $50+ h/s with these sandy bridge cpu's in order to keep them cool with a decent o/c. And yes that case has more than enough room for that h/s.