FWIW I have never found a .... ahem .... "session IPA" that was as sessionable as a good IPA....
I really enjoy Lagunitas Daytime which they refer to as a "fractional IPA" @ 4.65% ABV and 54 IBUs. I think it tastes a lot like their normal IPA.
Harvest Ale / Goslch / XPA #3 / American Strong Ale / Baltic Porter
Fermenting: Baltic Porter, German Brown
Up Next: Internat'l Pale Lager, Irish Red, XPA #4