Cooling Issue

[pcbuilder4ever]

I'm building a pc with sandybridge 2600k. Looking to overclock to 5Ghz. Do i go for Corasir H70 or another water cooler. Am i right in saying the h70 is self contained i dont have to keep refilling it. Is air cooler out of the question at 5Ghz.

 

[pcbuilder4ever]

Should i get the H70, Antec Kuhler 620 cpu watercooler, coolermaster v8, coolermaster v6gt. im confused, i want to run 24/7 around 4.5Ghz.(2600K)