It's all guitar-only stuff on Music For Nitrous Oxide, Ballasted and Avec Laudenum. I personally think this was their best period, I don't really subscribe to the band's sound once strings came into the picture. Considering you enjoy that though, you may find the earlier stuff too "dry"...at least some people do. Not much comes close to this though:
http://www.youtube.com/watch?v=ETvKeB9SL0E
I think I could comfortably call that SOTL's "Stone In Focus"
Ballasted Orchestra is a beautiful album, and yes, that is one of the best songs on the album.