If you can ever get your hands on fresh St. Peter's IPA, then you've found yourself the most luscious and flavorful session beer you could ever hope for.
I have to update this old thread.... Deschutes Mirror Pond belongs on my list. I don't think I've bought any beer more often than this one in the last six months and it's one of the few commercial beers that I'll drink more than one or two of in a night. Oh yeah, and Surly Abrasive! Cuz it's that time of year!!!
Raging ***** is hands down my favorite beer then Stone Ruination then pretty much any other IPA.
I really like Blue Moon Winter Abbey Ale too. Sometimes I'll get a six pack of the Abbey Ale and a six pack of an IPA and alternate between the two. It makes the IPAs taste hoppier and the Abbey Ale taste maltier.