Et tu, Brute? Et tu? Actually mine does get a run now and then, and she has the extra tender for additional water capacity....
What you really need is a Br.45 2-10-2, and a Br.85 2-10-2T. Just those two are already a lot to look at.
There's no reason for having German engines other than the fact that I like them, and occasionally they come up very cheaply on eBay. From 1926, they were up to 25 years ahead of Britain when it came to standardisation.
Before the Wagner standard era, there were things like this Saxon XX HV 2-8-2. This model came cheap because - as the photos show - it was slightly broken, but it works. The real 19.017 still exists but has never steamed in preservation; it owes its survival to having been used by the Halle research facility as a brake test engine during the East German DR era, and is the only one (of three Br.19s kept by Halle) that escaped being massively rebuilt.