Settled on a Remington 870 and considering which model I should get. I would like a 12 gauge pump I could use for HD (under the bed gun), clay target shooting, and occasional bird hunting (dove mostly). Could I get by with a 18 1/2 in barrel or do I really need to go with a longer barrel and maybe get a shorter barrrel (for HD) later? I erally like the Remington 887 Nitro Mag Tactical or maybe even its cheaper cousin - the Remington 870 Synthetic 7-round. I appreciate your thoughts! Thanks!