I'm not going to replace my previous versions, I just don't think its worth over £200. It needs reworking (lights and tender coupling) to make it into a state where it is a marginal improvement over it's predecessor.
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Steve, its good to see you praising some of the benefits of DCC. Hearing sound on this layout will be amazing. Is it too early to ask if you have any exhibitions planned?
Most systems have their own forums on which you can ask questions and lots of people are helpful with answers, Digitrains and NCE are two of which I know of.
Like most things in life, people get to hear of horror stories far more than successes.
2.0 litre goes like a train, the 1.8, well lets just say steer clear.
Low mileage <60k 2.0 NC is well worth £5k if body is sound, so if reasonable mileage 2.0 is worth £3k as the engine should be good for 200k miles