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You probably need to look at ED scopes in order to get a decent focuser, not to mention better optics.
Any 4" f/7 or smaller ED doublet or triplet that turns up in the classifieds should be ok to start with.
With a reducer/flattener on the 4" f/7 scope you're at 560mm focal length; anything under 600mm is easier for beginners to learn with.
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