Your best and most accurate answers will come from McIntosh call either Chuck Hinton or Ron Cornelious the 800 number is on the website. They are both very informative.
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I asked Ron Cornelius a couple of years ago about upgrading from a 6200 to a 6300 (I was deciding between the 63 and the 65).
These are both good models (63 and 65) and you seem to have a good understanding of the differences. We may have made the 6300 to close to our high end models in that is is not as thick sounding as the other integrated amps. This is a subtle difference though. Performance wise I would prefer the 6300 but both will be more modern than the 6200.