I haven't looked into it thoroughly, but the Tuniq has won quite a few benchmarks which i have seen.
The thing is, when you replace the fan on the Thermaltake Big Typhoon for a better performing fan, this improves the heatsinks efficiency quite a bit, so this could be quite a decent option too.
When I finally save up the money I?ll be going for the long awaited water cooling setup anyway. I?ll be looking to cut the noise down on my PC, this is going to be a big benefit in my eyes. Bit of fun with DIY aswell.