The stock fan is adequate for o/c'ing to about 230. I put on a blue orb (lapped) and got it up to 243. But all that is worth very little in the way of more fps. Unless your a junkee like me, I'd save your $7+ship.
As for drivers, this is my take on them so far:
10.80's: stable, fast
12.10's: stable, slower
12.90's: slightly unstable, faster than 10.80's
14.10's: stable, slower than 12.90's, faster than 10.80's