First off, I'll second Casey's recommendation of By Forces Unseen. HOWEVER, sometimes the descriptions are a tad hard to understand at first (as some slights are pretty complicated), and the routines themselves are very, very slight intensive and difficult. In about a month or two of practice I was only able to grasp two routines before shelving the book (I'll probably come back to it in a year or two when I'm better).
Second, I'll just put it out there that though it is nice to know some advanced routines, they are not always the ones that hit the hardest