If we can sign Matrix, I'd go with him over Mo Williams and not think twice.
Monta and Chandler are going to play 35+ every night. Shawn gives you added flexibility to further limit Dirk's minutes when you need to throughout the season because he can play the 4 for stretches.
Still wish there was a way, any way, we could work Marion AND Jameer into this group. That'd be a group we could go to battle with.