I would trade Kyle Lowry + Quincy Acy + 2nd Rounders for Avery Bradley + Courtney Lee + 1st Round Pick.
Avery Bradley is PERFECT for Coach Casey. Defensive point guard, aggressive, can hit the outside shot, athletic, but knows how to get the team involved.
Courtney Lee gives us another solid wing. I doubt he would take many minutes off of Ross. Derozan, Anderson, Fields capable playing the 3, play Ross or Lee at the 2.
This deal is not great to begin with, but how is Bradly a guy who knows ho to get the team involved? He's a horrible PG in that respect. He's a SG in PG's body...IN fact if he was 4 or 5 inches taller, he might be as good a prospect as, oh, say, Terrence Ross.