I think most people would agree that the mount is actually more important than the scope.
I would go an EQ5 rather than the 3. Your weights calculations suggest you are getting up to its limit already such that you couldn't add a guidescope without probably going over the weight allowance.
Astrophotography is a money pit and the accuracies and tolerances not as forgiving as visual.
Why not try a secondhand ED80 and EQ5 which would probably come in under your budget. I think there was one here recently for the $1000mark.
niko
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