http://www.frostytech.com/top5_lowprofile_heatsinks.cfm this has the best "short cpus heatsinks" i would go with the maxorb mainly cause i have owned one and they do great work. but just look at anything in the amd section and you should find something good. btw have fun with the ocing.
Ohh...yeah, I forget that, my 955 is AM3 . But maybe for a future upgrade.
My AM3 chips (710 & 965) have both used AM2 designated HSFs, on an AM2+/AM3 motherboard (DDR2, AM3 exclusive motherboards are DDR3). As far as I knew, when it comes to HSF, AM2 covers the formfactor up to AM3, including am2+.