While any brass steam from Sunset is highly unlikely in the near future, I would like a good model of the D16sb. Totally out of period for my NY&LB modeling, but so is my Gem F3 mogul. With all the agricultural lines that intersected with the NY&LB, it could have happened!
I have a late build HO E2 by Mantua that is quite good. I'm happy with that. The other O steam I'd love to see would be a K2, but I'm not holding my breath on that either.