Duck Man,

I think you brought up the most important thing yourself, fit. I have darned long arms and the guns that fit me best are my BPSs and Beretta Xtrema. Good fitting guns really increased the number of hits I make. I think the Nova may be the best choice of the guns you mentioned, 3.5" capable and a recoil reducer is available. The 3.5" shells are not generally necessary for most hunting, but the recoil reducer is a nice item what ever you are shooting out if the gun.

Handle a number of guns you can afford, with a hunting jacket on, and pick the one that comes to shoulder best. Long chambers and camoflage are nice to have, but nothing is better than having a gun that points naturally for you