In general a telescope never needs upgrading ever. Unfortunately its the aspirations that get upgraded.
(1) I want to see more so i need a bigger scope.
(2) I want a higher mag so i need a high power eyepiece
(3) I want very widefield so i need a low power eyepiece
(4) I am sick of field curvature and or seagulls so i need a parracor or extender
(5) I cant find things so i need an argo navis on my DOB
(6) I want to take photos so i need a camera
(7) better photos so a better mount
(8) not happy with photos so second guide scope
(9) and so on and so on
The list is endless.
Your list of wants will be very hard to reconcile for the price so i suggest the following. Since 600 bucks wont buy a very good refractor and mount i would buy a good set of large binos. These days 600 bucks will buy a lot of chinese bino. Upto and including Giant binos or not so giant binos and a good stand. Remember for 600 bucks you are only looking at maybe a 80 to 100 mm achromat plus mount so for the money go and get a set of 70 mm binos.
Just my thoughts
Paul
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