Many will disagree with me, but...
I would never buy a first SXS that could not shoot modern ammunition, preferably steel, OTC loads.
I have a slew of old doubles, and I find the greatest impediment to my using them is ammunition. My life doesn't provide as much time at the reloading bench as in the past, and it is sooooo much easier to just grab some OTC shells and go shooting.
That cuts the list way down.
If you don't plan to shoot it, but rather just look at it, then at $1,000.00 the field has many openings. Especially in hammer guns.
It might seem odd that ammunition determines using choice, but cartridges are the bottle neck for vintage doubles. Whether as reloads, or as specially loaded OTC offerings. One as time, the other as money.
Not everyone wants to pay $15.00 a round for skeet. And that's where it is for low pressure loads if you don't reload for yourself.
A decent afternoon with the kids (2) can run $150-$200 easily.