Funny, this is exactly how I got into psytrance. Shpongle > IM (who I really didn't like - I saw them live and thought the "singer" was a wanker) > Hallucinogen (In Dub) > Younger Brother... then it was Ott because he worked on Hallucinogen - In Dub. Then I found Prometheus and Entheogenic. After that I got a massive 10GB torrent of psytrance and slowly went through it, picking out the stuff I liked.
I've never found anything that was quite like Shpongle. I don't know if I will. Simon Posford is obviously a key element here. Look out for anything he touches. Good luck