I have a 7000 now, and only very new with it. so I'm not even going to try and compare the two as I've never really spent much time on an sdc, however one thing I have noticed is that everyone that i have seen that has a 7000 and sdc, very rarely do you ever see them with anything other than the 7000 the hands. And when I have seen them using the sdc it is only after they've gone over the area with the 7000.This is only an observation that I have made over the last 18 months.
personally I wouldn't sell the sdc!!! you know the rule, the man with the most toys wins