Sean,
I bought a Uniden (did I spell that right?)after reading an article in Car and Driver (I think). They said it was the most sensitive and just liked it all around. New car windows are treated to reduce solar loading and interior damage. Some windows use metalic deposits - these reduce the RADAR signal that gets to the detector. Some use "pigment" - these reduce LIDAR signals. So, the more sensitive the detector, the better. Plus, everyone worries about false tripping. One just learns when it is real. But, when you're on the open highway, speeding, and the unit trips, best to cut back to 5 mph over for a bit anyway.
I think I spent $100 on mine two years ago. Good luck.
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Jay