If your current ride didn't come with a GPS navigation system, you have two choices — buy a dash/windshield-mount system or replace your factory unit with a more advanced in-dash system. The Pioneer AVIC-D2 ($1,500) is definitely advanced. The DVD-based navigation system features an easy-to-read 6.5-inch touch-screen LCD, turn-by-turn voice guidance, and a sleek and understated double-din design that blends in perfectly with nearly any car or truck interior. [More]