http://www.bfgtech.com/sinks.html
I have used these on my geforce 4 ti 4600, they weren't needed really, but they helped for over clocking for me and did fairly well, tho I was over clocked to the max with my video card and couldn't possibly get higher with my geforce 4 ti 4600. I dont know if copper would be best, but you wouldn't quite need anything to cool the tsop modules.
These should fit ok, they stick to the top of two modules, I had it cooling all the BGA chips and hope they should work on other modules such as tsop and not touch anything.
However I think OCZ has the best set of them:
http://www.ocztechnology.com/products/accessories/
They have plenty of stuff, and copper ones, but I like the OCZ BGA Ramsinks the best and look good, not sure how well the copper ones hold up, they absorb the heat better, but not disapate the heat as efficiently. However the copper ones are thinner like you want and with their fins like they are might cool pretty well.
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