well,
the retail HS may just get you by...
you'll be real suprised at how good they are.
I would recamend the ax-478 HS for getting that extra few FSB out of the chip you'll get.
as for fans.....sunon, ystech, and panaflow are great names.
80mm is the size you need.
I would only get the delta fans if you realy don't mind the extra noise...yet they will realy help cool off that HS.
the ax-478 is also cheap if you can find it.
two or more quiet fans for case cooling is also recamended.
good luck
mica