Jager, I believe he said he wanted to get back into doubles - don't think he worried about being a niche gun. Actually I don't look at them as niche guns, but guns with the barrels in the proper position - horizontal, like your eyes. Never could understand how anyone could shoot one of those guns with the barrels vertical.
I shoot Remingtons, Ithacas, Parkers, and Lefevers and because I reload don't worry about non toxic shot because there's the proper wad between the barrel and shot. The BBS and SKB would be good bets for modern guns.
Too bad he does not live in Germany Waffen Frankonia has promo sale. One of the offerings is Merkel Bros. 40E 28" straight grip double triggers for kool €2879. Good gun for the money.