[Aka]

Zalman are pretty good. Don't bother with the 9500, just get a 7700. The 9500 isn't as good as the 7700s. It'll cool better at lower fan speeds, but at the highest setting it doesn't cool as well. And at all settings it's pretty darn quiet.

I've got Zalmans on all of my newer machines, and they're all overclocked to some degree.

Athlon XP 2500+ @ 2.2 GHz (~20% OC)*
Athlon X2 3800+ @ 2.4 GHz (20% OC)**
Intel Core 2 Duo @ 2.72 GHz (~27% OC)***
Dual Opteron 246 @ stock 2.0 GHz
ATI X800GT @ 621 MHz (~27% OC)

All run about 40-45C under full load.

* Locked, wont OC any better
** Motherboard restricts, clockgen can get me higher without problems
*** RAM restricted, is my Dads PC and he didn't want to spend the money on performance RAM. These C2D chips will OC like hell, that one is even undervolted by 0.05v.

Edit: You have a 25 cm fan blowing in the side and you have temps that high still? what's it blowing on? is it a heater? :P