It really depends on what you're looking into and your experience. If you already know basics, I'd go for the bible, has a HUGE amount of stuff (advanced and beginner) you can broaden your arsenal with. If you're looking to explore different types of manipulations, get XB II, has GREAT sections on pen spinning and dice stacking with some XCM thrown into the mix. Ultimately you should get both, just a matter of which you want first....