I use and Escort Passport 8500 X50. I've only received one ticket since I got the detector, and it was on a road where the speed changed from 50-30mph without any signs. I took a video of the road and went to court and still lost, but oh well. It picks up laser, ka, k, and x, but you can adjust the x-band sensitivity. It can track up to 8 different radar signals at a time, or it can show you just the strongest signal. Mine has saved my butt plenty of times, and I've got it hard wired in up above the rear view mirror via the project here, as well as have the "remote" turn-off down by the HVAC controls.
I think I paid $350 when it was brand new on the market 1 1/2 years ago.