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I'd probably take Detroit's 1-2 and Seattle vs Boston is a close call.
Both Verlander (hes turning into the top pitcher in the game) and Lester (utilizing the changeup has made him rediculously dominant over the past two starts) are individually the best starters in the AL along with Greinke and Halladay. I don't think Felix, Edwin Jackson, Bedard, and Beckett are that far behind but are clearly in the next tier behind those guys. Edwin Jackson looks like he may be joining the Top 5 list soon though.. hes been improving at a wicked pace.
Seattle 1-2 can compete with anybody's, and they have Washburn at #3 having a career year with capable BOR starters.