Absolutely stay away from VOW (Volunteer Ordnance Works / Dan Richardson).
I have had 3 FAL's built buy 3 different 'smiths who have a great rep at the FAL Files. My Rich Banks (PA-Patriot) L1A1 is a work of art, but Rich is not currently doing builds (that I know of).
Although I have not had a rifle built from ARS, AZEX or CGW, they are the big boys when it comes to getting rave reviews from their customers. If I had another kit to build, I would probably send it to Rich at CGW, and that is not meant as a knock against ARS or AZEX at all.
Two others to consider are Moses (Johnny / James Mayo) who was already mentioned, and Randy Kline (Sledgehammer Arms). Both have great reps at the FAL Files as well.
It has been my experience, that when getting a quote on build time, 1 week = 1 month - at least with the three smiths I've dealt with. YMMV