No question Detroit, they're so deep and so good this year it's hard to imagine anyone beating them come playoff time. IMO they would have won the finals last year had they simply not been so exhausted from two seven game series back to back to get to the finals.
San Antonio has a chance as long as Duncan stays healthy, if he gets hurt the Spurs won't repeat.
I can't see anyone else in the finals as of right now besides these two teams, they're just that much better than everyone else. And after watching both Spurs-Pistons games this year and seeing how the Spurs got manhandled, right now it's safe to say Detroit is almost a lock to win it all.
Next Sunday Detroit is playing Miami, that should give us a good gauge to judge if Detroit is a lock or not.