I would do Smart, Thompson, Timelord, Langford and a 1st for Beal in a heartbeat.
Gives us a three-headed monster of Tatum-Beal-Brown, still have Horford as well as quite a few young guys. Sign some veterans in free agency like Kent Bazemore (VetMin), Otto Porter (MLE - hopeful?), TJ McConnell, those types.
We'd have a legit title shot for a few years, as long as we replaced Horford with someone capable