Thanks Frank, your comments underscore my current thinking.
Jeeneia...appreciate your pragmatic approach. My publisher would be equally happy with Sibelius or Finale. As for 'Music Acquisition Syndrome'...no, I buy what I need, I'm immune to MAS! You're right, these top end programs are expensive & I don't expect to earn a fortune from the project, but I do expect to 'cover my costs' (eventually!)
          Thanks both for your contributions,
                                                                         Nigel P.