Next book to buy?

[roxtar]

Anniversary is in a few days and want to know which book to tell my wife I want as an anniversary gift. I have almost NO real money online experience and all of my live play experience is NL MTT's at home games and card rooms with what I would consider decent success considering how long I've been playing.

I've read Theory Of Poker, TPFAP, and Hold Em Poker and another book by Mcevoy that I didn't really care for.
What I want to know is given the books that I've read already, what books out there could give me some new insight into the game? I'm considering buying either Super System OR HOH vols 1 &amp; 2. Which would you guys recommend? <font color="red"> </font>