I expect the following percentages:
Bell 40%
Miles 38%
Hayward 33% (just looking at his college numbers, I don't know how you could expect him to be a great 3pt shooter instantly coming into the league)
AK 33%
Based on these projections, you would want Bell/AK to start and Miles/Hayward to come off the bench to maintain a solid shooting threat at all times. However, I really don't like Miles/Hayward together, as it will be pretty bad defensively. Perhaps starting Miles/AK, and then bring Bell/Hayward off the bench would be best. I suppose if you had Okur out there you could play Hayward/AK together, but which of those guys is going to play the 2?
Personally, my hope is that Miles continues his strong play from the playoffs, and blossoms into a legitimate 2 guard playing 32 mpg on good percentages from 3. If only he could defend 2 guards. Hopefully though with AK and Milsap behind him we can work through that weakness. I'm betting that Dwill/Miles/AK/Sap/AlJeff will be our best lineup next year.