My favorites are Imse Vimse & Bummis super whisper wraps (I prefer the snap ones). I'm a big fan of Motherease covers (love, love, love the Airflows but you'd need to Snappi a prefold in those), Flips & Econobums.
I wasn't a Thirsties Duo fan either. My little guy outgrew the Duo size 2's at 12 months.
Mom to my girls ('94), ('99) & ('02)
And my little guy (12/09)