Portal point guard is highest priority. Getting one will be the difference between big step forward and slow progress. Doesn't need to be the scorer that Willis is, just be a great ball handler and distributor.
Portal center is next but only one who will be a clear starter, strong rebounder and defender. If that guy not there, stick with developing TT, Payne, Ihnen, and Foxx for 4 and 5 spots. We would also take a proven 40% plus 3-point shooter if available. If he's not your clear starter, same rule applies. Play the freshmen.