You only mention the tube and mirror. Have you also considered the eyepieces that are available. Then there is the finder scope as well. Go to Bintel in Melbourne and have a good look at what you get for $699 compared with the likely dubious refurbished scope you are considering. I made the mistake of buying cheap because I thought that was all I could afford. I have been forking out money ever since.
Also find a local club and have a look at the various sizes, maybe you will find an 8" will give you what you want.
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