Thank you so much for the input everybody. Honestly, "too good to be true" was going through my head all day. I went to check out the camera yesterday and here's what I found:
-The guy is a film school grad and bought the camera new in 2006 after graduating.
-He used the camera for film projects, electronic press kits and weddings.
-The camera has around 300 hours of use
-There is a small scuff/chip near the perimeter of the lens, it does not appear anywhere in the frame when filming. The scratch is my biggest ? mark/concern.
-We used the camera to film a couple of minutes and everything looked and sounded great as far as I could tell
-Camera doesn't have many accessories other than a couple batteries, charger and the firewire cable
ZenSteve and Spinner, We discussed the fact that his camera is about 500 bucks cheaper than anywhere else I can find one, he feels due to the cosmetic condition (although I guess the lens scratch is more than cosmetic) and the hours of use, he thinks $500 is fair. He told me he is selling the camera because he bought one of the badass Canon DSLRs (7D, 5D?) and he now no longer ever uses the DVX100a.
Z.C., you probably have a good point about spending the extra $ to get one that has been checked out by a pro, but the extra $ is not in my equation at the moment.
I'm going back to look at the camera this afternoon, I'm going to bring a mic and a XLR to check out the audio inputs (thanks for the tip!).
The seller also let me know about a service person here in Nashville where he has taken the camera in the past. If I pick up the camera, I'll probably take it over for a thorough inspection by a pro.
Thank you again for everybody's input. I'll let you know if I buy the camera as I'm sure I'll have a whole slew of questions-haha!