I was sponsored on the elsinores, and the RM125 S too, both great bikes, the elsinore was my pick over the too, but in 1979 l raced a KX 125, and l thought it was a slug, the honda 73 to 75 was a much better bike. Later models got bigger and heavier. The 74 model Kx 125 A which l have now was one bike l would have liked to have ridden back in 1974, but my sponsorship kept me from not having one. The montesa VB 125 was a better looking bike than the A model, but it also was to late, and also had the same problem that the A model had.
My choice would be for pre 78 and that would be a well sorted Rm B model if you are looking for teller suspension if not l would buy a Honda. where do you live Lucien as my nephew has a very nice B model and he lives in Brisbane he may sell it.