Thank you, people. My decision's made.
Charles Binns - it might surprise you to know that (a) I still have my Holga and (b) I did give serious consideration to taking it. However, I'm still not confident using it and I want to guarantee, as far as I can, good results. My issue not the camera's. As a control freak, I need more practice with it.
Zapsnaps. David, you're the only person I know who would take a short telephoto as the only lens and I have to say that it's tempting to try it. However, my confidence is not high at the moment, to say the least, and I'm having to recede into a sort of comfort zone.
The Nikon is tempting as it's "auto everything" (if you want it to be) and that has a certain appeal. However, I would have to take a big bag and that's ruled it out because Cyprus is going to be bloody hot and I want to travel reasonably light. As a result of its of sheer portability and familiarity, I'm going to take the MP + 28/50/90. A bit predictable, maybe, but it wasn't when I posted the request - as I'd even considered taking the Sofort only and going wholly instant.
I'm not revealing which film I'm taking yet. You'll have to wait for that - but I will post some of the results when I get back.
Thank you all again.