Max,
I understand what you saying, hoverer a 6" glass is , well 6"!!!
Get a 5" apo for 2 times the price is still a 5" and low power shouldn't
be much a different.
For the same price there is a 80mm apo, and IMHO for deep sky just
no contest.
6" achro same price as the ~12" dob. Sure, the dob is going deeper,
but I already have a mirror.
Just imagine, 6" refractor+17mm Ethos..... 2+ deg field of view, and
at low power no CA issue....
