I'm also a big fan of the 28-ga. I like to say it recoils like a .410 and has the punch a 20-ga. Okay, the truth be told: perhaps a pinch more recoil than a .410 and a pinch less punch than a 20-ga.
The only problem with the 28-ga is that not enough folks shoot it, so the limited demand keeps ammo costs high. Like my friends 1-oz and BigJim, I recommend you consider reloading if you are going to shoot the 28-ga with any regularity.