Hi John,
I too begin with a list of features and benefits I want, then begin the search. Since I went with Canon so many years ago, I've become accustomed to the placement of buttons and controls, how the glass performs, etc., and have a stack of EF lenses, so I'm wedded to Canon. And the ergonomics fit me, too. At the since closed store, one of the salesmen was himself a semi-professional photographer, who at the time, was a Canon shooter. So I had the benefit of his experience with Canon gear. He had formerly been a Nikon shooter, switched to Canon, and about a year ago, went to the Oly 4/3 system.
Since the local store closing, I must rely on info I can gather from on-line sellers, my handy-dandy photography journals, and of course, THIS site. Recommendations made here are usually quite good, and if there is a question concerning a particular item, someone on one of the CiC threads will have the answer.
Zen