After SSHE

OK, the search function and I don't get along well. Its awesome helping me find something if I have the poster's handle, but not so good at giving me results. So please, no search comments. I have read and re-read SSHE. As well as re-re-read some of the tougher sections. I did quite well at the .5/1 (full ring and 6-max) levels at UB. Recently I went to Atlantic City and played 2/4 and 3/6 and found the book even more helpful with the players there. I won a lot, though its a small sample. With some of the money, I was going to buy another poker book. Next time I go in a few months, I am going to take a shot at 5/10 with my winnings. OK, so the question is, what book would be most beneficial to buy next?