The 10-15K drives need more cooling for sure, but I'm not sure they require water cooling. A simple finned sink and steady air flow should be enough.
And at much lower cost.
To me the only one I've seen (water cooler for drives) of interest to me would be the german made Evolution I which covers both of the sides and the top as well. And it's strongest point of interest isn't it's cooling of the drive, but it's very fine eye candy loods. It's about the finest eye candy I've seen. But it's cost makes your ideas look like a VERY low cost option.
