I like the idea of getting Horford but the fact he can walk after this season makes me a think Atlanta won't get back as much as they'd like. If they're giving up on winning it this year, throw them Lee, Young, Rozier, better of Boston/Dallas first and if needed, the 2 best non-Philly seconds. (if they want the Philly second, the other has to be the worst one coming to us).
It's not great but unless something is worked out ahead of time where we know Horford would sign with us, I'd hold off giving up a lot of assets for him.