Whamo,
It depends on what price range you are looking at. From what you've stated as to being a fisherman who will hunt occasionally, the SBE II or M-2 are pretty expensive guns. if you are set an an auto look at Beretta, Franchi, or Browning shotguns. They are all very dependable shotguns at a little lower price range. SBE's run about $1400, M-2's are $1100, and you can get a good shotgun in the $600 -$700 range especially for quail, or pheasant. i have never shot 3.5" shells and have always been successful hunting. 3" is plenty.
As for Camoing, I hunt a lot of ducks in natural cover so I have a camo shotgun. if you are hunting out of a blind then black or wood will work fine. Camoing really only helps with Duck and Geese. Not dove, quail, or pheasant. Plus getting a camo gun adds about $150.00 to the overall price.