Alpine Beer Company's Duet, Ballast Point's Sculpin and Russian River Brewing's Pliny the Elder
My favorite, as an IPA relative newbie, was the Duet single IPA from Alpine; it had a lovely floral fruity nose and taste with just enough bitterness to be very drinkable without any lingering bitterness. I found the Sculpin to be a little too bitter for my taste, particularly in the finish. The Pliny, a double IPA, was the most bitter, primarily in the taste, which I prefer, rather than the finish. I didn't recall the Pliny being so bitter, but tasting it side by side with the single IPAs really brought out the difference.