I got this from ebay http://tinyurl.com/2odpph (disregard what it says it's made for, it's a universal mount and fits anything under 4 inches wide)
Infact I have bought 3 (one for each car) and they work perfect for not only the N800 but especially the N770!! The arms are configurable so all your ports are accessible. It has also 3 attachment methods to your car and the gripping arms open smoothly. I dumped the other brands of car mounts because the gripping mounts always blocked the ports.