I'm using both Billion BiPAC-5112s and the Aztech 600E. I also have my old trusty 900E(B)2 just in case one of these dies.
I would love to use a LevelOne modem though. Tested one earlier last year and that damn thing was rock solid. Too bad I had to return it.
OT: Your nick is familiar, mike.. Olabit wasn't it?