i've got an '06 DVX -- the tony stewart edition....
this bike is a blast to throw around on the track and in the dirt, but is no good for any serious trail riding. $5200 seems like too much in my opinion, they sold for $5900 new....
if you feel like taking a road trip to the southern pa/baltimore area i'll sell you mine for $4000 -- it's got about 12 hours on it. the wheels are a bit banged up, but other than that, it's in great shape! it was sold new in June of this year.