White, Brogdon, Brown, Tatum, Horford. That's my favorite lineup.
Don't trust Smart, given how he has played over the last couple of months. Usage is up, assists are way down, efficiency has dropped, and he's picking up techs for stupid crap. Not the way I want him to play with this group. Unfortunately I do expect that he'll start and play heavy minutes.
Rob will play as much as he can realistically handle and should contribute, but against Philly and Milwaukee it's important to have Horford in the starting lineup.
Grant or Hauser as matchups dictate. Grant can help against Giannis but I think I'd otherwise prefer to give Hauser some run in the eighth slot.