Celtics in 6...
... because the lakers have home court advantage. The toughest opponets the lakers faced so far are the Suns which still has a weak defense and are far from physical.
The Celtics has a number of fearless guys that will get physical such as Perkins, KG (on 1 leg or not), Baby, Sheed. A good number of "experts" predicted the Magic would take out the Celtics and eventually win the championship because they were undefeated up to that point. The problem is they faced weak opponents just like the lakers have so far. The Celtics beat both the Cavs and Magic without homecourt, that tells you they are no joke.
Magic has a very complete team, elite & fast PG, dominating center presense, versitile perimeter player that can get his own shots in VC, a long skilled 4 in Lewis, good coach, decent bench, etc etc.
The reason VC, lewis and at times howard looked so off their game is because the Celtics D made them that way. Professional all star players don't all of a sudden disappear completely like these guys. The Celtics deserves some credit as they made Lebron look ineffective also.