The Rangers play in a tough division with two already good teams, and a much imporved Anaheim club. So they have a ways to go still.
Personally I see Anaheim returning to the form they were in two years ago and making it to the WS. From the NL I'd say either Houston or Chicago. The Central over there will be competitive as always.
As for my A's, they probably have the best rotation they've had in a long time. I don't care how many MVPs they lose, there are still three reasons why they will still be contenders. They did a good job signing Chavez long term, though not a better hitter than Tejada and Giambi, he was probably the most valuable one, as he plays a tough position very well. If Dye can actually get something going, Oakland has a very good shot.