Best case, without wild moves?
I'm not particularly greedy. Run it back. Marcus signs a one year deal for above his qualifying offer to appease him. Baynes signs using non-Bird rights. We cut ties with Nader, and sign Jabari Bird to a minimum contract. We use the MLE on Tyreke Evans. We keep Rozier and Morris even though they'll probably leave next year. We draft a rookie who can develop into a potential Smart / Rozier replacement next year.
Horford / Baynes / (Theis)
Tatum / Morris / Theis
Hayward / Tyreke / Ojeleye
Brown / Smart / Bird / Rookie
Irving / Rozier / Larkin
Now, if we're talking crazy best case, we trade for Lebron and Kawhi, using some combination of Kyrie, Tatum, Morris, Rozier and Smart. That leaves us with:
Horford
Kawhi
Hayward
Brown
Lebron
Get it done, Danny. Haha.