In my opinion stay with 3xxx series, after a nuvi 3790 device buying a 3490 or 3590 device will cover all the needs you described in your post and more with a reasonable price. After a 3xxx series device going to a 2xx5 or 2xx7 series device is a downgrade, these devices won't give you that feeling of quality or the features a 3xxx series device can give you. I wouldn't buy a 3597 either, doesn't have the pedestrian mode and is too big to carry around with you. It's a Navigonish device made for in car use only.