Pretty sure this would be the best one out there right now >
[ame="http://www.amazon.ca/Expert-Heads-Limit-Holdem-Volume/dp/1904468942/ref=pd_sim_sbs_b_1/181-2893237-1337811"]Expert Heads Up No Limit Hold'em, Volume 1: Optimal and Exploitative Strategies: Will Tipton: 9781904468943: Books - Amazon.ca[/ame]
(Expert Heads Up No Limit Hold'em Vol.1 - Optimal and Exploitative strategies by Will Tipton )