For Radar --
I run a Bel Sti/Magnum through Escort Live (online speedtrap database run through my Android phone). It runs slightly less sensitivity than the V1 (but in reality I think the V1 gives way too many false alerts from way too far away - I don't need to know who is running radar on the moon, just for the few miles in front of me, and several Bel/Escort products do that just fine).
The best thing about the Magnum is that it does not leak signal like other RDs and therefore is not detected by Spectre RDDs. I had been stopped twice while running a V1 and twice while running an Escort 9500i for no real reason (I don't speed much*) which led me to surmise that the ISP was pulling over every vehicle with a detector in it "because they just HAD to be doing something wrong if they are running a RD."
Once I even got a bogus ticket for "passing contrary to sign" because he couldn't get me for speeding. I think it was because I was in the MM and he detected the RD and thought I was an easy target.
Since getting the Bel Sti (which I later upgraded to a Magnum) I have not been stopped in 3 years or so.
Whatever you get, do NOT get a Cobra or anything by Rocky Mountain Radar, if they still exist. EDIT: The Crapras leak so much 24.1 signal my Bel goes off when following someone who is running one. Damn they are annoying!
Make up your own mind by searching Guys of Lidar and "radar detector forum." There are plenty of people out there who know much more than I and they own all the guns in question and have done scads of testing.
* - Insert question here about "if you don't speed, why run a RD?" Because it is a hobby, smart guy. (No, really - I can identify specific cruisers by their frequency around home now.)
For laser/lidar --
The best out there is a laser interceptor. Here is my (former) MM with one against an LTI 20/20 I rented:
http://www.youtube.com/watch?v=zyuw10XAJAI
http://www.youtube.com/watch?v=rJ10Q9QPwxE
They are pricey - search laser interceptor USA. But it makes you nigh invisible to lidar. They are illegal in some states, also, so check first.