Keep on reading. If you don't score on www.google.com then try searching for book titles on www.amazon.com and sort by "Best Review." You may want to see if your local library has copies of the books you are interested in. If you decide to buy, Amazon has used copies at usually half the price. Plus you can always sell the books you buy back.

Try Counter Hack by Ed Skoudis. Someone tipped me off to it the other day in a posting.