Epia Silent Cooling

I've got an Epia 800, and want to cool it passively with a big heatsink... have any of you replaced the default heatsink with your own - what have you used and how have you done it...

I was trying a Coolermaster XDream heatsink but cut it too much and it split in half, with the copper middle falling out !! doh!!!

I know there's a passive heatsink for the socket'd C3's so I should be able to do it, it's just a case of getting something to fit...

http://www.dansdata.com/coolercomp_p8.htm#c3