Health notwithstanding, Parsons would be an excellent get. Dallas stands to lose him after this year if they rebuild and he opts out. He started out overpaid, but with the cap situation, he could sign a new deal and make even more. Remove him from the team and Dallas picks top-7 this year (good for them, but we still hold a future pick).
He's a solid #2 option on offense who gives you excellent 3PT shooting, good rebounding, and is a good passer as well. He's also above average defensively and entering his prime years. Better player e.g. than Khris Middleton.