Tallon said the latest he'd trade back in the draft is ~7-10th overall, and they'd want a young roster player who can help them now as well. So I'd say Tanev + 6th overall to get the 1st.
I would argue it would be better to trade Kesler for the 10th + x and then offer part of that x + #6 for the first.
Then again, i am only saying i would prefer that over #6 + Tanev. With all the different rankings around there, i probably take my chance at 6 hoping someone i like falls to me and keep Tanev.