Winchester 1100, Browning Maxus, Franchi affiniti/intensity, Benelli Super Black Eagle, Browning A5 (not your grandpas A5), Winchester SX3/4, A300. Or whatever fits you the best. I'll go out on a limb and say the quality of most of the big names is pretty similar, although everyone has a preference, and an experience that has led them to prefer one brand over another. Find something that you like.
Pump Actions are a good option, not finicky on load weights, temperature, too much / too little oil, dirt, or salt. Rarely to they not cycle..
3 1/2" is also a nice option, even if you are not planning on shooting 3 1/2" shells, it allows you the option to cycle any 12ga ammunition that is available in the field. Who else has not brought enough ammo and borrowed from a friend in the blind? What if they only shoot 3 1/2", and you only have a 3" chamber? Done for the day. Bad deal if you are out for a snow goose hunt.