I think the Red Sox are on NESN. If you move to that market (and I'm guessing you are from Cincy), you'll be able to get the RSN but I don't think you'll get the locals. If you have the distant networks through NPS, though, I wouldn't even worry about purchasing additional locals. Just subscribe to AT100+ or AT200 and "move" to the area -- I did that and I didn't even subscribe to locals (of course, I live in North Georgia and get mine (along with SF) through NPS).
Somebody else will have to fill you in on the Yankees, but I'm pretty sure they play the majority of their games on YES and I don't think DISH Network carries YES as of yet. I've seen a few of their games on WWOR.
I wish I could get the Blue Jays but I don't think Rogers Sportsnet is on DISH Network and some of the guys around here might be able to tell you if it will ever be carried by DISH -- although I think it's doubtful. If things don't change by next year and you don't want the Orioles or Devil Rays (and it doesn't look as though you do), the Red Sox might be the only AL East team that you can go with.
Cade