I thought that Chelsea would'nt last when they started buying basically everyone at first but it seems that since Cech came into the team they've been rock solid (not that i think Cudicini was bad). They always had a good Midfield. But i dont think that they found a good consistent pairing upfront yet. They're my fav in the Premier league.
But my fav overall is Barca. They just seem unbeatable now. Remember when they came close to getting relegated couple years back. But now they are the strongest and most consistent team in the world i think ( mostly because i'm a Barca fan)