To plan your trip: travelocity.com.
Best for: Car rentals.
Winning features: The results include prices from up to 14 car-rental companies worldwide. The site also displays deals beyond the airport counter, since the best bargains are often off the beaten path.
Weak spots: Like many of its competitors, Travelocity doesn’t let you “price out” add-ons, like insurance and GPS. And it displays only pretax rates prominently, so you’ll have to look closely to find the final price.