which books?

I got 7000 pts and I was wondering which books do you guys recommend me reading. I haven't read any poker books yet. I been playing poker for around 5 months and I am making a pretty good profit in the lower limits. I usually play 25NL and .50/1.00 Limit. I want to move up in limits. I prefer NL, but also want to play limit in 2/4 or 3/6. I'm an online play and I don't play much live games.

http://www.boogster.com/store.asp?category=book

so which books do you guys think I should get?