Accessories Car Holder

[lambada]

Will be driving around South Africa for a month next October and want to use my Desire as a GPS navigator. Don't yet know what car I'm going to be renting and even if I did, the rental company could easily give me a different (but similar) one when I get there. Can anyone suggest a reliable holder which I can use with a charger connected? I'm guessing that one which sticks to the windscreen would be a safer bet because it's more universal than an air-vent version. Looking for something sturdy that doesn't let the phone vibrate too much. Thanks.