I'm playing with the Drupal Amazon node at the moment... Not quite sure why or what it does yet!
I've been having a nose around for GPS devices that 'speak' road names. It's a feature that both me and Jen agree is an improvement on the TomTom. The lowest priced Garmin that has this feature is the Nuvi 350:
It's a bit of a premium but I think that it's worth it.
amazon_ad_tag = "garanorg04-21"; amazon_ad_width = "468"; amazon_ad_height = "60";//--></script>