I'm surprised to have only seen a couple mentions of Bell's. I'm not a fan of all the styles they make, but every offering I've sampled has been well crafted. Not a clunker in the bunch as far as my tastes go. Are there better versions of any particular style from another brewery? Sure, but no one is as consistently good at everything they produce. My vote is also swayed because their Two Hearted Ale is my all-time favorite...
I'm not really into their 90 Shilling, but everything else I've had from Odell has been top notch. They're my runner-up.
American Stout, Breakfast Stout clone, Rye IPA, Braggot, Roggenbier, Pale Ale, Oat Stout, Apfelwein, Pliny Clone