Here's my theory about covering your bases.
Take a piece of paper and draw out the flight pattern of discs that you can reliably get up to speed. Then, make sure you have under stable (US), stable (S), and over stable (OS) discs that will leave you no holes on your paper larger than 20' around. Your putters (2-3) should automatically cover the first 250' so all that you have left is between 250 and your max distance. I leave a 2 putter option because your next longest US disc can be underpowered more reliably than faster discs and you can't get much of an S curve without speed and distance anyway.
Assuming you throw in the 400' and under range for max distance, this formula will most likely leave you with 2-3 putters, 2-3 slower mids, 2-3 longer mids, 3-4 fairways, and 4-5 long distance drivers (speed 11 max).
You don't want to be under or over powering more than you have to and the best way to ace or sink a long approach shot is to come in slow and easy as the disc is half way or better into it's low speed fade.