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I think the thing to realise is ..if you like the hobby and dont abandon it..and a lot of folk do ..you will buy many many scopes over the years.
You may find that if you stay with it you will be drawn to astro photography then it tends to become about the mount, the camera and then the scope.
If I could turn back the clock but armed with my experience I would go for a six or eight inch tube only on a EQ5 mount...the EQ5 mount will manage an eight inch and a DSLR camera ( by the time it is not good enough you will be into the next level ..... if you go that way the mount gives you a "goto" ..set up that means instant travel from object to object ..and in less than dark skies that will be handy..you select an object goto it and you see it or you dont..looking to find an object with a dob is really not easy and when starting may be very off putting. For me I would be buying the mount and putting on it what you can afford...and believe me a six inch is a very good scope and cheap as chips...
The resale value of that set up will hold better than just a dob. .and such a set up is most transportable.
I would buy the tube new certainly ..mirrors have a limited life so buying second hand may be false economy...but look for a good second hand mount in the classifieds here, but I believe in buying new is best so if you have a problem you can get help from the retailer.
Alex
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