l2h
I am going through the same process as you at the moment.  I used to have one of the original huntsman/slug gun combos that they made a couple of years ago.  I used a weaver #82 base, and one year, I had a Tasco 3-9x40 Bantam scope on it, then last year, had a 4-12x42 Tasco on it.  One thing I can tell you from my own experience is that the scope I had on it last year was wayyyyy to heavy/big for where I hunt at, but the 3-9 worked great when I had it on too.  I harvested two deer last year, one at 10 yards, and the other right about 30-35 yds.  I was thinking about it the other day, and out of all the deer I have harvested, the furthest has been right at 100 or so yards.  Anyways, because of that, for the stainless huntsman I just got, I am going to go with a simmons 8 point 4x32, or a simmons pro-diamond 4x32(haven't quite decided yet, but the 8 point is about 30-40 dollars cheaper), along with a scope base from h&r.  The weaver base worked great, I just want to have more options as to where I put the scope, rather than 2 slots.  For where I hunt, it should be the cat's meow, and I would say, it should work for as far as a huntsman is good for, without screwing with the smooth lines of the huntsman too much.  Hope this helps.
~~~Cattleskinner