Well to be honest, what the others have said is true, but then it does get to become a little bit like stamp collecting for some.
But back to your issue. Your 10" dob (see you've already bought it
) can be quite easily moved if you have flat access. If you were to get a cheap "fridge" trolley then a 10" Dob is very easy to move about. We use one at the Mapleton Observatory to shift the 12" outside and back in again. Certainly saves the back.
Should you get a 10"? Definitely. The increased light gathering power will allow you to see things you would not hope to see in your 6 inch. From my quick calculation you will have a mirror that is approx 2.8 x larger in area than your six inch mirror. Think of the increased light gathering power and the depth you will be able to go to pull out those faint fuzzy galaxies.
