I wouldn't worry about the range of detection so much anymore, even middle of the road detectors have more range than is useful. The important points are discretion of false signals, and features that lend themselves to your own discretion of signals.
I have yet to see a review that gives proper credit to Valentine for the directional arrows. The information you get from the arrows is indispensible in determining whether a particular alert is important or not.
Granted, $400 is a lot to swallow for a detector, as even i don't have one (I've got a cheap Cobra unit). The best defense against unwarranted speeding tickets is being very attentive to what is going on around you, and don't drive at unsafe speeds.
