I finally bit the bullet and bought the Verizon brand universal charger with extra USB port. Was concerned because nowhere on the package or device does it say anything about how many amps it tolerates. It was able to charge up my phone while running navigation, using Glympse, left the screen on, and did data speed tests. I also plugged in my iPad 2 into the extra port and that charged up as well. I'm pretty much sold on it. Not gonna bother trying to find a cheaper one.
Also, I tried out their dual USB car charger too... only charges in USB mode. Not enough juice. Its going back. That's fine. Looks like micro USB is going to be a standard for awhile so hopefully this charger is good for a number of years to come.
Sent from my Galaxy Nexus using DroidForums