I used the Bracketron, it worked pretty well. I still prefer the Droid car mount though, it's really secure.

 

Amazon.com: Motorola Droid Snap-on Hard Cover & Car Mount Combo: Electronics

 

I use the OEM car mount with the Innocase. I pop off the back cover to get it in. Front cover stays on - works out ok so far, done it hundreds of times and do the same thing with desktop charger.

 

Seidio offers a solution with mount and case.

If you don't find a combo you'd need to look into the generic mounts to find one that can accommodate your case.