I've always liked Garmin Nuvi units. All of them from the $100 stuff up to the $600 units run basically the same Nav functionality and maps (Kenwood in-dash units run Garmin software). Higher the price, the more features. Compare and contrast all of them here:
https://buy.garmin.com/shop/shop.do?cID=134
Simple mount design here:
Garmin Nav holder.. album | Ttschwing | Fotki.com, photo and video sharing made easy.