lol whats another good i7 930 cpu cooler that performs better than the h50?
How far do you want to overclock the CPU?
If you're leaving it at stock then the H50 will do fine, however there's cheaper ways of going about it.
Coolermaster Hyper 212+ is a great one on a budget, and you can get up to about 3.6GHz I think with temps in control. Same can be said for the Scythe Mugen II, Titan Fenrir and Thermolab Baram with a good 120mm fan.
If you want to push the sucker to over 4GHz then you're looking at the big guns - Prolimatech Megahalems or Thermalright Ultra 120-Extreme Rev C (MUST be a Rev C - it's got a boomerang-shaped hole in the bottom to tell the difference). Strap a pair of good 120mm fans in push/pull and you're away.