Sicilian - Taimanov
This modern variation goes 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 a6. It deals with all of the plans that both White and Black can choose. The author gives many suggestions for new lines of exploration, and gives exceptionally clear explanations of the basic strategies of the system. There are a number of illustratives games which show how the Taimanov strategies carry through to the middlegame and which will give you a genuine understanding of the system.