When you've decided on the gun that you're going to keep, set aside a hundred to hundred fifty bucks for a COMPETENT gunsmith. A properly worked 10# pull trigger will feel lighter than an out of the box 6#, unless of course you're spending large dollars on an out of the box gun.
The term "buttery smooth" is highly over used on triggers that are actually just not as rough as the commonplace but can be honestly applied to some. It is skilled labor intensive, not something anyone with a file and stone is going to do successfully and certainly not somethng you are going to find in a production handgun.
Arthritis runs heavy in my family and older friends, I sometimes think it may be something in the water :wink: and I'm just biding my time till it hits me. Personally, I'm willing to spend as much on the gunsmith as the weapon. Which brings up another point, I've done enough metal work to know that the quality of the finished product depends completly on the quality of materials started with.
My decision for my last pistol is almost finished, an all steel J-frame Smith in 357. The small grip frame allows me far greater range in shopping for heavily padded grips that fit and are comfortable without being huge. As the condition worsens (is that a word?) I can reduce the charges with off the shelf ammo till I get down to a 38 S&W. When I can't deal with that I'll just hang my wallet on the front door.