I have done quite a bit of research and will be going with the Escort Passport 9500ix. It isn't cheap, but then again, neither are the tickets.
Do a YouTube search for "Passport 9500ix". There are some good videos that show the V1 and 9500 head-to-head. It looks like the Pasport picks up signals way before the V1.
I also like the Laser Shifter (jammer) feature. I like the fact that the Passport allows you to turn off the shifter after you slow down. This will keep you from pissing off the cops when they try to tag you.