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Hi Colin,
Here's my 10 cents worth. I started with a 10" dob and later bought an EQ6 and mounted the 10" optical tube on the EQ6. I can put the tube back on the dob base for a quick visual setup or do astrophotography on the mount. I subsequently purchased an ED80 for widefield DSLR photography that can go on the EQ6 and then a guide scope.
The great thing about this approach is you get aperature at quite low cost early but can upgrade progressively as the budget allows (and I've done a lot of upgrading over the past year).
You can take basic lunar and planetary images through a dob without tracking but need to track for longer exposure deep sky imaging.
One issue with imaging using a dob is achieving focus as typically there isn't enough inward travel on the focuser (especially for DSLR's). There are a number of ways to get around this depending on how much the focus needs to move in.
Peter
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