I just got a clamp mount from ram-mount.com
It wasn't cheap, but a great temporary solution that looks permanent. I put padding on the areas that contact the dash area so that the aluminum surface would not get scratched. It's very sturdy too. I've never had to re-adjust it.
You can see it a little better fom this angle. The jockstrap looking thing under the screen isn't part of it, that's the Lotus cupholder
Here are the part numbers that I got...
RAP-B-121BU - Clamp base
RAP-B-201U-A - Short Arm
RAM-B-202-MA4U - Plate that attaches to the screen