DW barrel prices
Around here, a Dan Wesson barrel and shroud in any caliber/finish will run you at least a hundred bucks.
My 15-2 came originally with a 8"vent rib (non-underlugged), and since then I have picked up a 6"VH and a 4"VH. That 8" is plenty long for me and my needs, but I'll have to say that the 6" is more portable with little loss in accuracy due to sight radius. The 4" makes it much more holster-friendly, but any DW is kinda big and heavy to be packing on the hip for too long.
Here in Ohio, the minimum caliber for handgun hunting of whitetails is .357 and it must have at least a 6" barrel. I have worked up a pet hunting load of a 158gr cast lead SWC that runs 1550fps out of the 8" tube. That is right at SAAMI maximums according to my books, and the DW takes it in stride.