I'd say all the books listed already (TOP, HEPFAP, WTO) but also consider "The Psychology of Poker". It'll help you focus more on yourself and what type of player you are and thus help you identify which type of game best suits you to play in.

It'll also give you strategies to play the different types of players you'll come up against and a it containg quick reference points in how to assess the type of player you are up against even by the way they dress (if you are playing B&M games).

Definitely a great supplement for SSH and any of the other books listed.