Go with the H&R... I LOVE mine and I am not one who ussually goes the cheap route. I have the 20 gauge with a bull barrel, I took my first dear with it a couple of years back at over 125 yards... I have a mossberg 500 for Turkey as well as an Remington, I think these guns are great, but for a slug gun I would go with the H&R. Unless you have a lot of money burning a whole in your pocket than look at the Browning A-bolt (I have been tempted by this gun many a time).

One other thing, If you are getting a slug gun simply because you can't shoot rifle in your state, why not consider hunting with a muzzleloader, my TC Omega probably has even better range than my shotgun, you could even look at the new savages which can go out to 300 yards...