This mornings discussion put your entry #46 on top. The stylized graphic that is still recognizable as being an AB is very nicely done. Both of your other entries - #44 & #45 - also got a lot of positive attention.
#44 & 45 are both very solid entries. For the more "conservative" track, they are both very solid. #45 in particular is getting very good reviews from everyone as a very solid logo.
Not sure if the final decision will be for a subtle conservative logo, or for a more adventurous and visually compelling one. But your entry #46 is the leader for the more adventurous track, and #45 is a front runner for the conservative track.
Update: The web designer and the CFO both ganged up on me and overruled my exclusion of #86. They both like the infinity symbol, and say they can still see the ab in there.