In order...
Ballo
Mgbako
Reneau
Rice
I think its unlikely Rice gets it over Smith. So PG v PG, pretty unlikely. He could get it as a 2nd guard, but the Illinois foreign kid will be tough to beat out, Thornton from OSU, Harper at Rutgers, amongst others.
Reneau and Mack will have competitive numbers, but again, they're going to be competing with guys like Sandfort, Bailey, Garcia, etc...
Ballo, if he averages close to a double double, will likely be viewed as the best true "center', and that could get him in over some of other bigs that will be considered.