I don't see how you CANT take Halladay here. Proven starting pitcher, amazing numbers and great consistency. Every outing he's capable of going 9 innings, and usually gets to the 8th or further. Lifetime 10-5 record against the Yanks, and he maintains that 2-to-1 ratio over his career W/L record (117-60.)
Furthermore, this is Chamberlain's first start. The Yankees are afraid of keeping him in a game for more than 2 innings, and he's supposed to go 4+?? The Yankees bullpen is pretty horrid as it is, and now they'll be missing Joba.
I really cannot see how anyone can lay chalk with this guy today. Getting Halladay at any point for + money is huge, and getting it against someone who probably won't even go 5 innings is even better. There's two possible no-brainer plays for me: 1st 5 innings UNDER, and Blue Jays ML.