See here.
Do not buy Super/System: it isn't really that appropriate for most players, nor is it even close to the "best" book out there (whatever that means).
Sklansky's Theory of Poker and/or NLHE Theory and Practice are probably the "best" books out there if you don't pick a specific area poker. See above thread link before you run out and make these your first books, however.
My guess would be "Strategy and tactics for winning poker play" but I could be wrongAliengenius, i see you have Killer poker on the list under#4 which killer poker is it? Since there is so many of them... And also is it really that useful? i looked through it once in the store and didnt look that great.