I like the idea of radar detectors that have good range and notification of red light or speed cameras. What I don't like about radar detectors is the cord you have to plug in to your cigarette lighter. Yes, there are versions that are wireless (but the batteries don't last long enough and the effective range is shorter), and there are even versions with solar panels (but they look hideous).
With all of that in mind, the Cobra iRadar is the closest I have come to pulling my wallet out for a radar detector. The Cobra iRadar integrates with your iPhone via Bluetooth and has a sweet UI via the iPhone screen. There are too many settings to talk about and the Cobra iRadar video does a decent job, so watch it.