I always thought RAMsinks were more of a fashion statement than actual performance thing. Unless we are talking about those who are trying to get that last 1% or 2%, and even then ambient temps and quality of IC's themselves has more to do with it than anything RAMsinks-wise. Heck, I bought my RAM because the RAMsinks matched my system color scheme and looked pretty spiffy overall. The price, manufacturer, or even the IC quality didn't count as much.
A big part of it is that vast majority of IC's on the market come from maybe 2 or 3 far east producers which are then slapped onto various boards and resold by OCZ, GSkill, PNY and what-have-you as "unique" products, when in reality the only difference between all these products from different manufacturers are the actual RAMsinks themselves. Heck, it has become a bit embarrassing for various resellers that corporations like OCZ, PNY, and similar actually request that some of their IC's be free of any markings at all. No part number, no nothing. That way you can't point out that a stick of RAM from PNY costs twice as much as OCZ one, yet they use same chips/IC's.
In conclusion, go for the prettiest RAMsink.