I have this mount for my X50v:
http://www.semsons.com/ipogpsrecrmo4.html
I really like it because I can rotate it to landscape, and it holds the Axim securely.
It also has a power port that you can use to power your GPS receiver. Just use the pull down to select the type of connector.
I use iGuidance. It's the first turn-by-turn GPS I've ever used, but found it easy and powerful. However, just like all in car GPSs, sometimes you have to follow directions with a grain of salt.