Great list mazan!
I was hoping to narrow down the list based on their hometown. I recall based on fairchij's impeccable notes that they were in San Fran courting the selected PR firm. This rules out #1 on the list - Edelman is based in NY.
Almost all of the firms below it are in San Francisco - it must be the mecca of PR.
Anything in the top 3 (excluding Edelman would make me excited!!
Atomic PR, W2O or SparkPR gets my vote.