Its all about what you want out of your gun and how serious you take your deer hunting. If your figuring to keep your shots inside of (75 yards or less) than you should be fine with a SB.
On the other hand, if you enjoy venison, big racks and think you might get a crack at 100 yards, head on over and talk to the guys at Johnson's or the Cabin Range and get something that will reach out a bit.
Once a gun is sighted in with those high dollar slugs, how much are you really going to shoot it? You ain't shooting a slug gun for fun. Leave your fun plinking to a .22 rimjob.
Although I haven't used a slug gun much in the past 5 or 6 years, prior to that I used a rifled bore slug gun since about 1985 or so. BRI slugs, baby. Man did they fly like crap but they did kill when they encountered flesh & bone!
Accuracy is EVERYTHING.