If you want top of the line with the earliest detection possible, go with the Passport X50, or Bell 65. (the Passport and Bell look different, but are both owned by the same company now. The test results are identical, so most reviewers believe they have the same electronics on the inside.) Valentine is also very good, but has not done as well in independent tests in the last couple of years. If you can settle for a good radar detector for a good price look at Whistler. The Whistler Pro 73 can be purchased for around $150.00. In comparison tests the Whistler Pro 73 usually comes in just behind the Passport 8500 X50 and Bell 65, but only costs about half the price.