I really do think the Celtics have a big advantage in closing out games. On some level the stat-head side of me says that close games are usually somewhat a flip of the coin, but on the other hand Miami's horrible record in close games and Boston's dominant record really can't have occurred by pure luck. So I see us beating the Heat largely because of that.
Plus, I think this is exactly the series the Celtics needed in order to get some major switch-flipping mentality. There's no doubt in my mind that the Celtics are going to give it 100% and really bring their A game to the table.
I think that if the C's can beat the Heat they'll probably be able to win it all (assuming Shaq makes it back for Bulls/Thunder (or Lakers))