I have no problem with folks who travel the country chasing steam locomotives, it's just not my thing. When I do visit some tourist line I usually buy a ticket to help support them, but for me riding behind such and so locomotive is little more thrilling than riding Amtrak. Givin the chance to run an other than Sumpter Valley locomotive I would probably take it, but I do not seek those out.
Therefore my list is very short: I have fired and run SVRR's #3 and #19, gas #100, diesels #110 and #118, and diesel-electric #720. I also briefly ran Porter #1203 when it was on the Sumpter Valley. I still like to take Heisler #3 out occasionally, but after 38 years I mostly try to stay out of the cab and concentrate on shop work.