Mike Conley. Probably not worth 6 straight up, but seems like there could be a trade with those 2 teams.
maybe Conley, Brooks, Rabb for Johnson, 6. Gets the Suns the veteran PG, a nice wing prospect in Brooks, and another youngish player in Rabb for 6 and a high priced guy that is repetitive and unnecessary.
Not sure that is quite enough value for the Suns, but that seems like something that could be explored.