GPS and mount

I use a Garmin Streetpilot 2720, with Garmin Motorcycle Cradle Kit #010-10495-00, mounted with a RAM Mount Kit RAMB149Z-A. I already had the Streetpilot for use in my "Bonnie GXP", and got the accessories from gpscity.com on ebay for the stuff I needed to convert it for a bike..

I am not at all familiar with the Quest, but the features I like on my Streetpilot are its large touch screen, mph indicator, trip computer, headphones audio out, waterproof, and, oh yeah - I can put in routes. :-D

The Quest probably does all that, too.

Yes it is a U-bolt mount to the bars. The u-bolt is available, I believe, in cadmium plated, stainless steel, or painted black. The bracket that holds the GPS is a Garmin part, and accepts a standard mounting plate as that offered by RamMount. Here's a link to the hardware at gpscity:
Various GPS mounts

The other items I needed were the Garmin bracket that holds the GPS and fastens to the RamMount, and a motorcycle power cable, which is very different than the power cable used in my car.