We are threadjacking, so I will start another thread in the touring sub-forum about down gearing options for the Specialized AWOL.

At the moment I am keeping my 30-39-50 up front and am going to go with a 9-speed 12-36 in the rear with a Deore 592 derailleur to handle the 36t cog on the cassette, keeping the stock Sora STI shifters.

With that 105 crankset, I think you will need to carefully look at the total capacity of the front derailleur. I don't know about others, but the Sora FD can only handle a tooth difference of 20, so dropping to a 26t granny ring is out, for me at least, with the stock FSA Omega crankset.