"O" , Portability is only a state of mind, but aperture is everything. Unless your mode of transport prohibits anything larger than a Nexstar 4 I would suggest that you hold off with a purchase until you have had a chance to look through a few telescopes (at night) at a local gathering. The difference in light gathering power between a 4 inch Mak and an 8 inch is enormous and an 8inch SCT or Mak will be as transportable as the 4 inch (unless you don't have a car). If GoTo is not a necessity it's worth considering a Dob as they represent the absolute maximum performance for your dollars.
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