Jumijo - I have the "K-Marx" version, though not the True Marx.
I also recently found a version that I wanted badly in my early teens, but didn't get: the HO Athearn version. $10.95/$15.95 kit/r-t-r in 1962 or so. I paid $40.00 for mine this year. Actually, that's cheaper. It's in my "tiny locomotive" collection.
The Weaver version is really appealing, but the B&M is not relevant to me and the price
is high. Not necessarily too high, but more than a "nice to have" is worth to me.
Now, if I live to see the sometimes mythical Blow-Out/estate sale, hmmm.
But how could I explain the B&M(!) in amongst my GM&O, L&N and Southern Railway
steam? I guess I could sneak it in around all my NYC stuff - less "wrong".