Kava's great, it really relaxes you. Another one to look into is Calea, which helps induce lucid dreaming. There's a lot of them out there, you simply have to find the ones for you. Personally I go to
www.Iamshaman.com, they've been reliable in the past. But hey, it's up to you, just because one wasn't your cup of tea :P, doesn't mean that all of them are useless.