I'm not a fan of investing big money in Livingston or Bledsoe for the same reason I didn't like getting Rush in the trade last year. Injuries can sometimes get you a good player at a discount, but I'd never pay full price for a player with an injury history like the three aforementioned players.
I'd be very happy with either Deng or Ariza and wouldn't mind paying market price to get them. I wouldn't overpay for either. It'll depend on who they hire as the coach before I want to invest too much into any free agents.
Gobert, Favors, Kanter, Deng/Ariza, Williams, Hayward, Burks, Burk, Neto and a couple new draft picks is a substantial upgrade over last year's roster. That's a pretty cheap roster for the time being. See how the top rookie develops and hope they force their way into the starting lineup sooner as opposed to later.