The only truely great detector is the Valentine One. It has the largest range, the best detection from distance, arrows that are really helpful to let you know where the radar is coming from, and the best feature is the bogey that lets you know how many radar sources are being detected. i will explain why this is a good thing.....
Say you drive the same route everyday and pass, lets say a car dealership, and your detector always goes off every day at the same spot. Now with a normal detector you would learn to just ignore that spot. But lets say you have a Valentine One and are driving down that same road and every day it goes off and lists a bogey count of 2. Now lets say that a cop decides to sit there one day. This time when you go buy your Vanetine One's bogey counter reads 3 or 4. Now you know that there must be a cop sitting there. If you had a normal detector you would never know! Same thing goes for cops sitting on the road and then having a second car a mile or so down the road hidden. The Valetine will let you know there are two cops.
The Passport Escort has a decent range to it as well but it still falls short of the Valentine, and it has no directinal arrows and no bogey counter.
Also do not be fooled. There are no radar detectors that can jam radar, and there are no detectors that can save you from laser detection. None of the current detectors can pick up Laser until it actually hits your car because the beam is so focused, and by then it is too late.
One more benefit to the Valetine is that if they ever come up with something new you can send your detector back to them and they will upgrade it so that you do not have to buy a whole new detector.