Before you decide,pick up one of the better pumps, a BPS (notice BigJim mentioned that model above) or a benelli nova. The action on a higher end pump is radically different IMHO. The 500's and 870's are reliable and rugged but are MUCH easier to short stroke because the actions just aren't as smooth. One other note on the BPS the drop at the comb is different than the others I've tried. The barrel seems just fractionally higher. This means it kicks backward more and upward less. What this means in practical situations is the muzzle rise is minimized so you stay on target better and you can transition to the next target quicker. I've just never used anything that engaged multiple targets as well. Very confidence inspiring in a HD weapon.
Gaily bedight, A gallant knight In sunshine and in shadow, Had journeyed long, Singing a song, In search of El Dorado