Since you are mainly interested in visual, I vote for the used LX90 for reasons of price and portability. Otherwise, a 10" dob with or without argo navis. I have both of these and I still haven't decided which one I like the most. (my dob is not computerised). The fast set-up, freedom from gadgets and extra brightness is nice on the dob - not having a computer between you and the stars lets you get closer to them in a way. Being able to find anything in a flash and tracking with the LX90 is nice but I tend to look at specific objects and miss the stuff in between them. I say buy two scopes
