Car charger for iPad 2

Looking at car chargers and think I have it narrowed down to 2, the Kensington Power Bolt Micro and the Griffin PowerDuo 2 amp charger, the last also comes with a wall adapter. Any thoughts on car chargers?

I picked up this one for $10. Nothing fancy.
Amazon.com: High Output Dual USB Port Car Charger for iPad, Samsung Galaxy, iPhone, BlackBerry, Droid, GPS, and Other Tablets, Smart Phones and High Powered Devices: Electronics

1 5W and 1 10W plug - so you can plug in your iPad and iPhone both. There is a 6 ft cable for $4 so you have room to put your ipad somewhere.
Amazon.com: 6 Foot Long USB Data Sync Cable For iPod, iPhone 2G 3G 3GS, iPad, iPhone 4, All Models Compatible: Electronics

I have used the Griffin PowerJolt plus for about 10 months and it works great with the iPad, iPad 2 and iPhone 4. I love it for charging my iPhone because it's so much faster than the iPhone charger. Haven't tried the PowerDuo version.