Hello suckingwind,
The PB425 Bi-level is new but I think it is worthy of a suggestion. You can see it at:
http://www.cpap.com/productpage/1543
We have had feedback from a few customers and they say it is very quiet, plus you can't beat the size. Or really the price either. Bi-level's are expensive machines, but the extra $50 or $75 for this machine is worth it.
ICP