Hey Brad.
A 6 or 8" dob sounds like it fits perfectly for your short-medium term needs then. Portable, easy to transport and setup for 1 person, and will give you great views of the sky.
The moon and planets will look excellent in it, and you WILL be able to take photos with your D70, either afocally or at prime focus. You'll see plenty of detail, no worries there.
Whatever accessories you buy for the dob will most likely be transportable between it and your next bigger purchase, including eyepieces, filters etc. If you get an SCT next, the adapters may not fit but that's only a small part.
I'd recommend as per Starkler then, the 6" or 8" dob sounds perfect for you.
Let us know what you get and be sure to post photos and first light reports!
