I just bought the Whistler XTR-695 (literally 2 minutes ago) to use only during my long distance drivings so that'll be only when I mount it. Amazon has it today for $99.99 with free shipping versus the list price of $249.95 so that was another good incentive. Here's the item:
Amazon.com: Whistler XTR-695 Laser/Radar Detector with Radar Signature ID, Laser Signature ID, 7-Color Display, Real Voice Alerts and External Audio Jack: Electronics.