The better question is what kind of experience you are looking for, if a heavier more sedating kava is your choice, I'd go with Nangol Noble or a headier experience would fall in the category of Fu'u or 'EUA. The best approach, imo is a sample pack;
Yep, I second the sampler pack. It gives a good range of the kava products he offers, and helps you narrow down the type of kava that sings your specific song.