Any recommendations for an iPhone 3GS bean bag / friction mount system for a car?

I've been looking for a good beanbag/friction mount type of car mount. When I had my old Garmin GPS, I used this (http://www.amazon.com/Garmin-Portable-Dashboard-StreetPilot-Navigators/dp/B000LRMS66/ref=pd_cp_e_0) and it worked perfectly. No windshield suction mess, it was easily portable, and never slipped at all. I'd love to find something like that for the iPhone 3GS (with a case), but I'm not really seeing it.

The closest that I can find seems to be the ARKON SM212 Black Deluxe Weighted Friction Style Dash Mount. Here is a sample link from Newegg.

http://www.newegg.com/Product/Product.aspx?Item=N82E16875999400

Has anyone used this mount, or can recommend similar mounts? Ideally, I'd like to be able to just pick it up from the dash and throw it in a truck console when I get to my destination. It would only be used when I need the iPhone for GPS purposes. Having a bottom passthrough for a car charger would be nice too.

Thanks for your help!

Just a note to those who may be interested...I went ahead and bought this, and it works very nicely. We used it as a GPS mount, and for playing streaming audio on a recent trip to the beach, and it was very good.

It holds the iPhone with a case snugly and juuuust manages to allow you to plug it in to a car charger. Now, using a car charger and an aux cable does create a wee mess of wires, but the Arkon itself works and is heavy enough to where I haven't even installed the safety loop catch yet.