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Spend the most of your money on the mount first. Don't mess about.
This hobby is about getting repeatable results that you will be able to subsequently process to the best of your abilities. You need a mount that just does its stuff..
Then get (and this is the important bit) the CCD and scope COMBINATION that gives you the best imaging scale for the objects you are interested in. There is no "best scope" without the right CCD. You can buy a top of the range Tak and still struggle to get the detail you want without the right CCD.
if you can get a self guiding CCD with the guiding Chip in front of the filters then the you do away with a lot of the anguish around guiding.
So with your reference to the point around 80/20, I personally dont think it works that way.
It's not about getting a small increase in data quality, its about generating repeatable and consistently good data capture results. Whilst lens or mirror quality will add value, local conditions will have a big part to play, but being able to consistently and repeatedly generate good quality data will give you the better overall outcome.
If you get to a repeatable process then that's when the subsequent extra bung on lens/mirror comes into play. This is why Martin Pugh's presentation on his "war cry"at last years AAIC was so interesting. He didn't mention "brand", but focused on setup and process.
Good question.
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