I think the Mariners will end up falling close to where they did last year, ending with about 86 or 87 wins. I think outside King Felix and Lee their depth has some issues in the rotation. Rowland-Smith will probably have a decent season, but based on Felix and Lee's best winning seasons (19 and 22, 41 total) the bullpen and rotation have to come up with the other 45 or 46 wins. The Mariners won 85 last year and King Felix was the only pitcher on the team to achieve double-digit victories so it could be done. Despite losing Russell Branyan's 31 homers from last year, their lineup should be better with the additions of Chone Figgins and Milton Bradley. The acquisition of Casey Kotchman is a nice defensive upgrade, but I honestly cannot wait until the Major League arrival of Dustin Ackley! Chemistry will be a huge factor in whether this team will win the division or not and Milton Bradley is a "chemistry killer." Hopefully, he shapes up!
I don't think the loss of John Lackey will hurt the Angels as bad as expected. They have the best starting rotation in the AL West with Ervin Santana, Joe Saunders, Jered Weaver, Scott Kazmir, and Joel Pineiro. The question is how they will fill the void of Chone Figgins and his role in the leadoff position. They have plenty of speed from Maicer Izturis, Erick Aybar, and Howie Kendrick, but none will match Figgins' 42 stolen bases in 2009. Izturis who I think would be the most likely candidate will not start often unless either Aybar or Kendrick are injured. Figgins' replacement at third base, Brandon Wood, will bring some pop to the lineup. He respectively had 101 home runs over the last four years between Double A and Triple A and in 2005 he hit 43 home runs for Class A Rancho Cucamonga. On the downside, he has a big hole in his swing and strikes out often, very Jack Cust-like for fellow A's fans. Hideki Matsui will slide right into the DH position voided by Vlad the Impaler and no one will even know he is gone (until Texas comes to town and the fans feel the wind again from that big hack of his).
So with that all said, I think the LA Angels will remain on top of the AL West this year. Seattle 2 or 3 games back, followed by Texas and Beane Ball Oakland.