While I love Rick Steves Guidebooks, especially the logistics, he doesn't cover everything. Planning a Dolomites and Innsbruck trip, and the RS book covers only Venice and Salzburg. Also planning a trip to southern Italy (Adriatic Coast, Puglia), also not covered by RS.
What brand of guidebooks do you like best (and why) to reference when you off off the RS path? Lonely Planet, Fommers, etc?