If you already own a C50, why go backwards and get a C40? C50 was a successor/ improvement of the C40.
Unless you plan to get the C40 for the nasty winter training use and don't want to get the C50 dirty then that makes sense. But if you are getting it just to have another Colnago, then you should go up the hierarchy of Colnagos instead of down.
I own a pre-B stay C40 that I dearly love, but the C50 overall is probably the better performing frame in most respects. If you were a collector of Colnagos, I would say the C40 would be a must have for its impact on carbon frame design, as well as a distinguished racing history.
If you are looking primarily for an upgrade in performance to the C50, either the Extreme C or Extreme Power could be seen as alternatives. Go to the Colnago website for a first look at the all new CX-1 Revolution, which will be available sometime next year. In the meantime, enjoy your C50, one of the nicest frames ever!
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