Is it new or used? condition if used? stainless or nitride or blued? That will make a difference in price. I have a Optima V2 with 26" barrel nitride, .50 cal. very accurate!! Got it to hunt late season nasty weather or rainy conditions, killed three deer so far in late seasons.
I don't see any advantage in the extra 2" of barrel unless you plan on long shots, that might make a difference, but within 125yds probably not.