Two points; if you are very likely to get a GoTo Dob at some not too distant
time, get it now[while sales are on] as adding the GoTo kit to a Dob is
more expensive than buying one in the first place.
Skywatcher collapsible Dobs do not need collimating every time you use
them; they hold collimation very well indeed. I tweaked mine every few months.
raymo
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