Just being objective here: Miami
I think they are going to get a pretty decent center this offseason and they are just so uber-talented. It came as a huge shock that they lost last season and they had only scraps around their big 3. If they can get any of Chandler, Nene, or Dalembert this offseason, a decent point guard, and build some chemistry, they should be so hard to beat.
I agree with you that Miami is scary because of their location and everyone wants to play there. Chandler and Nene are not going to Miami because of financial reasons and I don't even know if Dalembert is an upgrade to Joel Anthony. As for a pg that could bolster their situation, I'm just not seeing anyone out there on the market and in their price range that would be better than Bibby and Chalmers. A Battier or Caron addition would scare me the most because I think Lebron or Dwyane could run point or they could go small, and Mike Miller was abysmal last season.
There was on article on SI.com that said it looks like Miami will miss out on Dalembert.
That Sammy won't be available for the MLE after all. That there is enough interest in him to get a better deal elsewhere.
Something to watch over the next week. See if that report pans out or falls through. Dalembert would be a really big difference maker (in terms of a role player) for that squad.