It's really tight at the top of the table...Man U is out ahead, but not by all that much, and Spurs (and Bolton?!?) are in easy range. Sunderland only got promoted to the EPL a couple of years ago, and they are sitting nicely as well, only a few points out of Euro qualification at the moment.
Sunderland have gotten great contributions from the players they got on loan this season, especially Welbeck and Onuoha.
Watch out for Stoke, too. Their "long ball" style is tough for most teams to defend. I really like Kenwyne Jones.