Reuben Fine's 30 chess principles demonstrated through games of Paul Morphy. 10 each for Opening, Middlegame and Endgame. Contains just shy of 70 annotated games. Considering the quantity and quality of information you get for your time and money it's hard to get better value. The playing style might be a bit romantic for the modern player and maybe you can do it if you're as good as Morphy, but the principles are there. Probably of less value the more experienced you already are, but ideal as you learn how to play the game.