Absolutely the Valentine one. It is pricey (though the same as it's competitor the passport 8500) but mine has EASILY paid for it'self 10 times over. It's range is incredible, and it has never falsed on the open highway for me in the 7 months I have owned it. If it chirps, there is a cop.check :http://www.speedzones.com/ for a bunch of tests on everything you could imagine.