Look at getting an AntiLaser Priority laser jammer, it pays for its self if your state is mostly laser like in OH. It is a bit pricey for the base system, but get hit 3 or 4 times and it has paid for its self. I have been hit probably 50 times since getting one, majority of those being 20-25 over the PSL. An awesome laser jammer with a decent radar detector is your best bet. The 9500xi is what I use to compliment my jammer and it works great!
As far as legality of the jammer, it is actually sold and marketed as a "parking system" and with a simple click of a button, it goes from laser jammer to parking assistance with no jamming function, so if you were to ever be pulled over, you can actually have the officer test your system and it will not jam anything yet will detect when something is getting close to the bumper and beep like a normal parking sensor would.