I can heartily endorse the Ruger Label 28 gauge. I've got one with 28" barrels and the regular pistol-grip stock, and that gun never fails to make me smile. Carries like pool cue, recoil is next to none and it smacks on the business end harder than it has any right to. When it comes to pheasant, though, I restrict that one to game-farm duty. I like something with a bit heavier shot charge for wild or state-released birds.
I too, was a rile/pistol shooter before taking up shtogunning. There was definitely some unlearning to do followed by lots of practice and new learning. Ended up adopting a pretty simple method (move/mount/shoot) espoused by Michael McIntosh is his book "Shotguns and Shooting." Spent a lot of spring and summer time on the skeet field shooting this way, and it really helped my bird hunting in the fall and winter.
I still try to get out once a week for four rounds of skeet. I don't worry about scores as much as doing it properly and understanding the why of it when I miss. I tend to hang right around 85/100, which I think is fairly respectable for a guy shooting from an unmounted or "low" gun. It's good practice, it's fun and it helps me not go too nuts waiting for November.