I would like to add that if it's for Irish Music, you should rarely have to stretch the bellows by much. Just check videos of Noel Hill, Edel Fox, Tim Collins and others play. I don't know how they do it, but they seem to always be able to keep their bellows at mid stretched level or less.
I had an Edgley for 4-5 years when I started and loved it, but as others have said I really doubt a normally functioning Edgley would make much of a difference over a normally functioning Morse. Also, a good hybrid will play as well as a good Suttner, Dipper, Jeffries and other high end instruments but that's the sound that will be very different, in my opinion.
EDIT: I once had a concertina with which I was always stretching the bellows a lot, but I found out later that was because the bellows were heavily leaking and had many small punctures. With airtight bellows, even with only six folds, I rarely have to stretch by much...
Edited by Azalin, 12 September 2014 - 01:46 PM.