I5-3570k and gtx 660 oc combo need cpu cooler

Hello.

My recent build has:
- i5-3570k
- gigabyte gtx 600 oc
- 4x2 corsair vengeance ram
- gigabyte z77x-ud3h
- cooler master storm enforcer (case) with 2x200mm fans (front (intake), top (exhaust)), 1x120mm fan (back, exhaust).

I have only played one game with this system so far, CoH (original, opposing fronts, and tales of valor) on the highest settings possible (ultra) with anti-aliasing etc.

I haven't noticed much stuttering (maybe none- I think I am just being picky). I ran the game's performance "benchmarker" and got an average frame rate of 49.7 (min 22.6, max 50.9). Eventhough this is just an rts game, my pc does feel a bit warmer after playing this game for a couple of hours.

I am not intending on oc'ing (yet!), but do you guys think that the cpu stock fan is enough for this system or should I get an aftermarket heat sink fan (if so, what do you recommend)?

Thanks for your help.