here is a good site that compares Garmin models:
GPSNOW
Sams Club has the Nuvi 350 for about $550, not waterproof, but neither is my laptop, but very small
the zumo looks nice, but bluetooth!!!, do you really want caller ID when you out riding, lol
the 20hr battery on the quest is also nice, and has the trip display: current speed, average speed, max speed :razz: