How much have you got to spend?
How to disappear (or even dead pony club also by Brewdog) is lovely and light enough to drink a few, but it falls down, for me, on the session beer stakes for being a bit pricey for a case of them.
Darkstar Hophead is a good one at 3.8%, and Buxton Brewery Jacobs Ladder is also a good shout at 2.8% (10p per bottle going to the local MRT as well.)
There are a whole load at that percentage if you poke around.