Moonchild:

As I understand it, the Gibson B-25 was a very cheap, student guitar, in its time. Granted, the years have mellowed it, and it has sentimental value to you, but it may not be worth enough for you to worry very much about. It is not sought after by collectors. You should have it appraised by a knowledgable dealer, to put it in perspective.

The B-25 is also a small bodied guitar, @14 1/4" across the lower bout, similar to a Martin 0 or 00 size. If that size is what you are comfortable with, then stay away from dreadnoughts and jumbos. I'm bigger than you, but I'm still much more comfortable with my OM (000) size guitar, with its 15" lower bout, than I ever was with my 16", Gibson J-50 dreadnought. It's not just the inch or so. The whole guitar is smaller, shallower and easier to wrap my arms around.

EZR