The commercial dobs in the 8-12inch range are good value for money. Add an Argo navis computer and you have a good "push to" system.
The 16" models are bulky and heavy to move, as well as having various problems to do with the old-fashioned design and cheap particle board mount.
For $5000 you could also get a computerised cassegrain from Meade or Celestron. Maybe the LX 90? Then you have Goto and tracking.
But better to go to a few viewing nights and try the different types of scopes to see what you like first, as others have wisely said.
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