My personal favorite is Southern Tier Brewing Company's 2XIPA. I'm also a fan of most of Southern Tier's other beers, especially Phin & Matt's, Old Man Winter, and Hop Sun (which just came into season recently, so I need to go get some). Some of my other favorites include Bell's Two Hearted Ale and Sierra Nevada Pale Ale. I'm also a big fan of IPAs in general, as well as regular Pale Ales to a lesser extent.