Antony states he is looking for something "
and is easy to transport and set up. " hence he is looking maybe to escape the LP now and then. In that case a good 4" refractor is good option. Even a smaller newt works better in darker skies. I took my 80mm to a seriously dark site once and it almost scared me there was so much visible.
Clarification Antony please .... if we understand your plans you may get better advice. Personally I'd have both ( Ooops, already do ...
) just to cover all my options. You never know when the beast will awaken and summon you to look up again.