What's your budget? And are you using anything from a previous system?
Q6600, p35 based board and a decent air cooler? the rest of your componants are pretty sweet dude.
Failing that, get a decent cooler and clock the nuts out of the e6300, some people have managed 100% clocks from these...
my 6300 is at 3.2ghz already!
Is that you're max?
stable yes