Re: new turkey gun
I've owned both an 835 and an 870. I like the 835 more. I've upgraded mine a bit with a Strut Stopper Choke, Rail Mount, Tru-Glo Holographic red dot, and a Blackhawk recoil reducing butt stock. With the port from the choke and the recoil reducer stock I can shoot ten 3 1/2" mags out of it as fast as I can and won't feel a thing after.
This entire setup can be had for around $500. If you can't put all of that into it I'd suggest just getting the new butt stock and add a choke, rail, and sight over time.
Just my .02