I think the best bet would be to trade Pierce for a top 5 pick, say Sacramento's #5 pick, and draft Barnes. Sacramento is in need of a veteran presence and have the cap room to take on his contract. As for us, we could use the money saved and give Hibbert a max deal at 12:01 and force Indy to match. If they do, you could then focus on McGee, for around 10-12M. In fact, I think McGee is the better fit, despite being the consolation prize, for the uptempo attack we seem to want to run. With our cap space we would also be able to re-sign KG and Green (Pierce replacement), plus also make a strong run at Mayo (Allen replacement).
KG
Green
Hibbert or McGee
Rondo
Bradley
Mayo would be our 6th man in a 3 man backcourt rotation with Rondo and Bradley. Barnes can back up Green when Green either sits or slides to the 4. Johnson and our 1st rd draft pick can battle it out for the backup 4. While Steimsma and Wilcox can fight for minutes behind Hibbert/McGee.
A 9 man rotation that has good interior size and overall athleticism.