Thanks to the spacers on the top of my stem, I was never able to mount my Garmin Edge 800 to the stem as they suggest. Instead I mounted it to the handlebar using the Garmin mount kit, but it was never very stable and placed the GPS at an odd angle. The other day I picked up the Garmin Edge mount from K-Edge. It attaches to the handlebar and places the Edge GPS unit directly in front of the stem at an angle that is perfect for viewing while riding. While some may consider it a little pricey, I don't think its too bad for a nicely crafted piece of aluminum that just plain works.
WHERE TO BUY:
• K-Edge Garmin Edge GPS Mount at JensonUSA