Downtube are clearing their 2007 full suspension bike for $319 last time I checked. This is a capable bike on the road and ideal for off-road use too. Link below:
http://www.downtube.com/Downtube_200...ntube_9FS.html
I have a 8 speed hub geared model and a student of mine bought 2 of the full susppension models. They are a steal at $319 and just as good or better than lots of more expensive makes. Lots of bang for your buck.