Savrasov is both the correct & obvious answer.
I hope the starting 5 features him as SF next to Dae Dae, Jimmy, Dixon, & Mahorcic. That is a group with the size, scoring, rebounding, athleticism & defense to do big things. Tre could be a 6th Man Award candidate while spelling PFs & centers/controlling foul issues. The 2 young PGs would keep Jimmy & Dae Dae both fresh & out of foul trouble while the Drame's do the same for Savrasov & Dixon. I can also see Chabi making a major impact with 10 or so minutes per game. Barring a rash of injuries, a couple of the guys above turning out to be duds, or one of these 3 being an amazing surprise, I don't really see how Necas, Barba, or Hronsky could get any meaningful minutes.
If Mahorcic could stay healthy for the entire season while averaging at least 25 minutes a game, he would be the man. Unfortunately, given his history of limited playing time when he has been healthy & serious injuries, this seems very unlikely. From what I have read & seen he is the only player on this team with the combination of size, skill, experience, talent, & body to be a potential all-conference player at a high major school. Bringing him in was, yet another, calculated risk I am onboard with. Playing even 17 minutes per game he is almost guaranteed to make a far more impactful contribution to consistent winning than Reece, Gunn, Rotroff, etc....