I would do #3 and Bradley for Butler, because Butler is a star. I wouldn't throw in Crowder or Smart and I REALLY wouldn't throw in any other Nets' picks or the Memphis pick. However, we'd be a dramatically better team with him on the court and I think it's likely that he'll be very good for the next 5 years. A 1st team All-Defense guard and the 3rd pick in the draft is not an unfair package.
Yes, our main weaknesses are PF and C, but the third draft pick isn't going to address any of those anyways. IT + Butler would make us a very attractive FA destination, too.