One other thing... The DC800 is a great little camera, but it is not the latest version that SeaLife makes. They have recently come out with the DC1000 10MegPix camera setup.
Although the DC800 is more than adequate for most purposes, some people absolutely must have the latest and greatest technology. This leaves dealers and other diver "technophiles" with what is considered "last years model" if ya know what I mean.
Consequently, you may be able to pick up the complete set (DC800) for a considerable discount. If you do buy one used, just be sure that it has not been flooded...
Good luck, and safe diving.