We bought a Garmin recently, only $200, but no bluetooth or waterproof..
sits in a bag from Givi, with a waterproof pouch, works well enough.
I can spend 800 bucks on lots more interesting stuff
A word of advice, if I may: we had a Via Michelin GPS before,
took it thru the airport in Munich.. they did something to it, and now it doesnt work.
In Europe at least they are now making you open and turn on your laptops, buddy
comes by with what looks like a big magnet and sweeps the puter.
After, all temp files, cookies, browsing history.. gone.. wow
So, if you are flying, be careful with bringing these kinds of things through security;
dont know if anyone has a similar in the US, but they are getting weird over here.