If you are a "south-paw" the Ithica is very nice due to it's bottom ejection. IMHO, the gun's only minor short comings are that you must remove the butt stock in order to strip the action, and if you wish to switch loads, it is not as handy to retract a shell from the chamber and drop in one of another type as it is with side ejecting pumps.
Your steel shot/slug concerns can be resolved by cutting the barrel off behind the choke and threading the bore for removable chokes. While this is best done by a gunsmith, it is not horribly expensive. If it was me, I would install a better (softer) recoil pad, with large screw recesses so that you do not risk damage to the pad which must be removed for maintenance and cleaning of the gun. I think the KICK-EEZ Special Purpose might be a good choice for the Ithica.