Social engine radar detector
There are 3 great things about this detector: price, performance, people powered. I got this on sale for less than $100. It works well, pick up a cruiser with instant on, plus with the free app for you iphone or droid, it marks icons on a map. You'll be able to see threats even before you start driving. As more people buy it, it becomes even more accurate as you have an army of citizens showing all the danger zones. Plus, the power cord has a USB port to charge up your phone if necessary.
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Highly recommend as the app still works passively if you forgot your detector at home. If you have a passenger, they can download the app and be your radar buddy.