There is an excellent Genii Forum thread on the ACAAN that starts out with a discussion of the Berglas ACAAN but covers a lot more at: Genii ACAAN Thread
My recommendations are:
(1) John Born's book "Meant to Be"--there are a number of different versions from intermediate to advanced and it's an interesting read.It's available from John's homepage.
(2) Alain Nu's softbound manuscript called "Any Card." A wonderful treatise on the ACAAN with fascinating stories how he developed his method starting with the Berglas plot. And how he got those 4 specials on The Learning Channel using this ACAAN. It's available from David London at: Alain Nu
(3) Barrie Richardson's ACAAN in his book "Theater of the Mind" and an improved version in his second book called "Act Two."
The best one for you depends on whether you can think quickly on your feet(Nu and Richardson). If not, Born's book has a few simpler ones that require very little mental manipulations. Hope this helps