TomTom GO 510 - Portable GPS System - Preloaded Maps Loaded on a 1GB SD Card $599.95

Easy to use:

Plug & GO: Works straight out of the box. Portable: Easy to take from car to car. Touchscreen: Easy to operate. And no awkward buttons! Extra wide LCD screen: 4 inch high quality LCD screen with crystal-clear 3D graphics, 480x272 pixels and 64,000 colors. For optimal visibility.

Buy.com is carrying this Portable GPS System for $599.95