I went through the same process as you when I was looking for radar detectors last year. I ended up purchasing the Valentine1 because it just plain works everyrime and I like the arrows alot. The Passport and Escort, etc. are good too. I would just google radar detectors and read all you can about them and then make your own decision. The Val1 can also be upgraded with new circuits and technology as the technology changes which t ome is a big plus for this company.
Google "inviscord" and you'll see how to wire into your mirror. It takes about 5 minutes to install and works very well. I use the suction cup mount for the Val1 because I'm a very tall driver and the unit is not in my line of sight. Mirror mounts and Visor mounts are good too. It's whatever floats your boat. Figure on about 8" inviscord if you use suction cup.
The Val1 has detection to all 4 quadrants-front, sides, and rear. It's saved my butt at least 4-5 times. Around town, I don't really use it because it's so sensitive to X band and will pick up the automatic doors, etc and give false alarms. You can program it out and customize what signals you want.
I hope this helps and Good luck with your search.
Oh by the way,
to the Forum. I think you'll find this a very friendly helpful place and also make some new friends.