Thanks everyone... so the answer is: get a 12"... unless you want the 10"...
No, but seriously folks... it looks like 12" is the way to go if I can do it. And I did consider getting something smaller to start with... but I think I'm only going to get one go at this (I'm still trying to work out how to break this telescope idea to the missus, I can just imagine her reaction...

)
Sure would be nice to have something to take to Cambroon later in the month...