I'd have to go with RRTCM it has if not all then at least most of the basic card slieghts that you will need to become profficiant in Card Magic. It also includes tricks that empoly the slieght you have just leaned.
The one downside is that some consider the Language a little archaic, but it wasn't a problem for me
Here is the contents page for RRTCM
l Preface
l The Overhand Shuffle, I
l The Riffle Shuffle
l Flourishes
l The Glide
l The Glimpse
l The Key Card
l The Palm
l The Backslip
l The Overhand Shuffle, II
l False Shuffles and Cuts
l The DL and Turnover
l The Pass
l Miscellaneous Flourishes
l The Reverses
l The Hindu Shuffle and Other Controls
l The Classic Force
l Top and Bottom Changes
l Arrangements
l Routines
l Platform Tricks