Cool, thanks! I was going to go with a 102 Achromatic that I can double as an imager with narrow band as Ive gone from a 10" Schmidt-Newt to an 8" standard Newt so my weight has changed heaps and the 80 ST isn't a good imaging scope. Both the 8" and the 4" are f5, so with a diagonal, the 4" should do okay.
