check out
Radar Detector Jammer Forum... you'll find everythign you need.
where do you live? chances are your officers stepped up to using LASER, INSTANT-ON, and the always popular VASCAR...
I went through a few radar detectors, notably the 9500i, V1, x50, and 9500CI..
Unless you're willing to get a LASER JAMMER (for good protection =$$$$), VEIL, and not BE COMPLETELY STUPID.. radar detectors aren't really worth it.
Don't get a false sense of security. While your radar detector might help you out every once in a while (did for me, nothing too spectactular...), there are a lot of other tools the police will use to nail you.