To me Personally if it doesn't have two barrels SxS it just not really worth owning. My personal preference, Current or Past Fads notwithstanding is 28" barrels. I am only about 5' 8" & a "Standard" 14" pull fits me just fine. I feel a Double Gun with a barrel length of approximately twice the pull length has good proportions & have no problem shooting a barrel of that length. To me either long barrels with short stocks or short barrels with long stocks just look out of proportion.
Certainly can't agree with 8 bore on the Stevens 311. Although some of the guns I hunt with cost less than $300.00 way back when I bought them they were a good bit higher than a 311 at that same time frame.