Thinking about purchasing a set from O27 or 15" (max length) Madison/Heavyweight passenger cars. Definitely want the full interior, not the silhouettes. The O27s from MTH (Rugged Rails) appear to be very hard to find as a set as I have with PRR and NYC. It looks like a few forum sponsors have 15"ers in Lionel, MTH, and even some NOS K-Lines.
The K-Lines appear to be the most attractive based on pictures I've seen but I'm a bit concerned about replacement parts.
Any recommendations from those that own the Lionel, MTH, or K-Lines?