Thank you all for the responses and debate. Very interesting reading.
A couple of points I should have been clearer on in my original post:-
* I realise that selling the tak will not give me enough cash to buy a QHY9s and the Esprit, but it would sure help!
* I currently use a QHY8pro, and love it. It has a couple of minor quirks but nothing that can't be overcome. Want to move over to a mono and maybe even dabble in narrowband down the road.
* I will be sticking with the HEQ5 mount for a while, I can get 20 minute guided subs so I think it does well, albeit I haven't owned another mount so I don't have a comparison.
When I bought the Baby Q (second hand ) I thought it would be a keeper for life. Maybe it still will be. There is no denying its a great little scope. But if I have to make a compromise somewhere in order to get a mono camera would the step down (or across? ) to a Esprit 80 be too much of a compromise. I guess only by having the two scopes and comparing them is the only sure way to find out.
I am happy that there has been discussion for keeping the tak and also small praise for the Esprit. I haven't made a decision yet and Sky Rover ULT 115 is in the back of my mind now also!

Thanks again for the excellent, helpful information and discussion.
Cheers
Jeremy