Lonely Planet India: Gives insight into the Indian culture, lists important destinations and offers practical details (train times, phone numbers, etc.) about most places to visit in India.
Rough Guide to India: A comprehensive guide to India with stunning photography. Has detailed and illustrated sections on Sacred India, Handicrafts, Bollywood, temple architecture, Indian classical music, etc.
Fodor's India: Fodor's is good for getting high-end hotel and restaurant recommendations. Also has a system of putting stars on highly recommended sights.
Frommer's India: This book has very detailed introductory sections that…