My initial reaction (maybe because I've already been thinking about Mozgov): Get him. He's tall, and huge, and reasonably skilled for a guy his size. And did I mention huge?
My co-worker who's a Nuggets fan says Mozgov is solid, he just happens to be on a team with a lot of center depth. I prefer to keep Melo, so if we can get Mozgov and Randolph for Bass, great. Bass might make a nice backup to Faried and/or Gallinari, and Boston gets a couple of 7-footers to beef up its frontcourt. Start Mozgov, move KG to the 4, bring Sully in to spell KG, Wilcox for Mozgov, then you still have Randolph for extra relief, and Collins as a situational guy.