The boys at Overclockers Club Canada look at the Tweakmonster BGA RAMsinks...
From what I hear they're suppose to be the best, you can find their review here.
The RAMsinks are very good looking and SHINY. They are finished by chrome
plating - it's a decently heavy plating that even if they were knocking one
another in the packaging, I highly doubt they would chip. Overall the finish
of the chroming is very smooth on the upper/visible surfaces of the sinks. However,
on the bottom there is a residual ridge from the plating process - this is really
the only negative I encountered with them and as you shall see in a moment,
20-30 minutes of light work will easily alleviate this concern.