So far the only kava I have drank that really wont make me tired at all regardless of how much of it I drink is KWK Fiji Loa Waka. I'm interested to hear what you guys say about this.
GHK Mo'i is nice for an uplifting session. I agree about the KWK Loa Waka. Also KWK Pouni Ono, but that has a bit of a sedating edge to it, more so than the others.
Also strangely enough, I found N@H's Stone to be pretty uplifting...