An 8 inch dob would be a good starting point. If you decide later to dabble in Astrophotography the OTA from the dob will make a manageable setup on an HEQ5 or EQ6 mount. Most late model dobs or newt OTA's come with 2 inch focussers so your EP set will work nicely. With 10 inches or more you will see fainter objects, but the tradeoff is portability and ease of setup.
FWIW York optical are currently advertising the Skywatcher 8 inch dob (SW680) for $599, and there is a
discount offer of 20% for Iceinspace members if ordering on line which would make the SW680 around $480 .