Here’s the criteria:
It’s got to fit a Socket-A
It’s got to clip on, as I have no holes in this mobo.
Within those boundaries, what’s the best CPU heatsink out there…IYHO?
(This Volcano 6Cu+ just ain’t cuttin’ it anymore)
Well, my humble opinion won’t count for much since I’m still using the same Volcano 6Cu+ that isn’t cutting it for you. 
(I’m not too crazy about it either).
You may want to check out the Heatsink Reviews and Tips section at overclockers.com