I'd get a sampler pack from GHK and have the hubby stick with it to find out what he likes.
Also I've had every variety Shakas suggested except for the Wow and the Low Waka, and they are all shining examples of the kava spectrum.
Lastly, when I introduce kava to someone, I try to start with a variety that is somewhat palatable, i make sure it is prepared correctly so nausea hopefully won't be an issue, and their stomach is good and empty to make sure they have the a good chance of a positive experience with the best effects. Sharing kava with my wife has been a very good thing for our marriage. I understand why it is used before important decision making circumstances in tribal life.