Can't really say as if it's worth it, but if you've got the money and you'd prefer the new, that is the way I would go. I wouldn't worry about not being able to have it serviced for a long time to come, plus they are simple enough there isn't much fixing a decent smith couldn't do one way or the next. One plus for the older frames is that you can get a stainless if that is what you like, I don't think the G2 is available in stainless yet.
For a straight wall pistol cartridge for deer, I'd recommend a .357 Maximum if you handload. If you don't mind the 14" barrel, you can really reach out with it. Mine's an easy 200 yard shooter on varmints with the lighter pistol bullets also, makes a mess of them though. I wouldn't hesitate to drop the hammer on a whitetail with it at that distance with proper bullets either. 180gr Hornady SSP works great in mine for accuracy and it's a pointed bullet. Shoots gas checked lead very well also, but I shoot 200gr bullets to keep the velocity around 1800 fps. A lot easier on the hands than a .44, at least the way the recoil feels to me, and it shoots flatter by a good margin.