Actually, I've heard good things about the SP94, read good reviews of the SP94, Zalman CNP-7000-Cu and the ThermalTake PIPE101 -- they're all in that "class" of cooling solution although the Zalman weighs in at 775 grams while the TT is 500, and I think the SP94 is closer to the TT.
I BELIEVE I've achieved the same or better performance than the Zalman with the TT PIPE101 and a "UFO" 92mm TT fan.
I'm contemplating replacing the UFO fan with a Vantec Tornado 92mm, but prefer to mount the fan with a bracket to the rear case panel and the cross-beam that sits even with the upper edge of the processor in a tower case. The Vantec weighs in at 187 grams. And it pushes 119 CFM at about 4,800 rpm (and 50-something decibels!!) So I'm not really eager to mount it on the heatsink, but maybe it would be OK . . .