I currently own a Intel 4670k processor, and plan to OC to 4.1gz. I have the Rosewill Aiolos Heatsink and 120mm fan. I also will have a case that will have 3 stock 120mm fans.(It is the cooler master CM Storm Scout 2, fans seem pretty decent.) And am buying 2 cooler master jetflo 120mm fans so i will have 5 120mm fans installed in the case and the 120mm fan on heatsink. Will i have any problems Overclocking to 4.1ghz. More importantly will i have to liquid cool? I don't plan on going over 4.1ghz. I also have the Z87 Sabertooth motherboard.
for 4.1ghz you should be ok with a simple aftermarket air cooler but, 4.3GHz and above may need something like a closed loop water cooling kit such as the H80i/H100i or a high end air cooler such as the Noctua NH-D14.
If you mod your case, a Kraken x60, but the 212 should be good enough for you. Like the others stated, you'll need something better for higher OC. Noctua, H100i, or something like that. If you're willing to shell out a little more for cooling, a custom loop would be a nice choice. If you want to go to insane OC's though, you might want to check out peltiers.