H techs are supposed to be significantly more compliant than the S techs, but from what I understand, discontinued.
Look into Prodrive as well, these are also well balanced and have better ride quality than most other aftermarket springs.
After riding in the Prodrive demo car I can say that as far as ride quality was concerned, it didn't really feel like they were aftermarket springs. Definitely better ride quality than other springs I've experienced (but I have not experienced H techs.) When he started doing things that were pushing the suspension you could definitely tell they weren't stock springs.