There is no such thing as 'best' size across board types, manufacturers (a 155 Burton could be very different from a 155 NS or a 155 Yes), camber profile, etc. For each board then, size depends on a lot of factors including rider weight, ability, riding style, typical conditions - and most importantly rider preference.
Your AB is a little on the long side for you- unless you are riding a lot of pow or super high speed, one size shorter would be better for you. But it is by no means a major issue - one size up or down really does not make that much of a difference.
Last edited by hktrdr; 01-05-2013 at 10:02 PM.