I played an acoustic Godin a few months ago, which I really liked. Unfortunately, I cannot remember the model.
Probably not as good for thrashing as it would be for simple chord playing (a la Dylan), and/or fingerpicking.
Also, Simon & Patrick can be nice
wwwguitars.simonandpatrick.com/.htm
They seem to have some kind of association with Godin, I think.
I wondered if, when you talked about the possibility of developing arthritis, you were actually thinking of the danger of developing repetitive strain injuries.
I have had these badly (from guitar playing and typing) in my arms and hands for about 20 years.
I have found that thicker gauge strings can cause/exacerbate this problem (so I stick to .10s at the thickest), and have found that various stretches and exercises, done a few times a day, can make the difference between consistent - and sometimes extreme - pain, and something that is hardly bothersome (PM me, if you would like me to share these exercises). I have also been using a TENS machine for almost 30 years, and find that very helpful.
Good luck with your search.