If you like the more mellow IPA's, you should definitely try the Great Lakes Commodore Perry. Its one of the most smooth drinking IPAs I've had (all of GL stuff seem to have this great smooth taste). And its right in your backyard!
Like so many brews since I started HB'ing,I'll have to go back & try The GLCP again. I like that Christmas porter they make too. K-Mart carries,among others Brooklyn brewery's India Pale Ale. That one's supposed to be more like the original IPA. I wouldn't mind a 6'r of the Harpoon IPA right now.