Heatsink - It depends on what overclock you are aiming for...
If upto 3.8GHz, then here are few options...
1. Xig Dark knight
2. Scythe mugen 2
3. Sunbeam CCTF 120MM + 1366 retention bracket
If you want to touch 4GHz(though there wont be much performance improvement over 3.8GHz and reaching 4GHz would depend more on the chip - Preferably D0 stepping), then
Any of these coolers with 2 fans in Push-Pull config
3. Scythe Mugen 2
4. Sunbeam CCTF