I'm currently on the hunt for a really good sat nav, I work as a delivery driver for Parcel Force and need a decent one, I have 2 Garmin nuvi's at the moment, the 760t and the 1340, both are very slow and that maps are not that accurate, quite often, it will try to send me to the wrong location,

Things I would like it to do if possible is.....

Have accurate maps,
Have clear maps that are easy to read, if find the garmin maps a bit plain and everything sort of fades into everything else, i like to see all the little side roads and back roads while on my route.
Search for location by company name, for example "Lynden Foods" or "Donnelly Group" (would be very helpful)
route optimization (if possible) for best route from point A to point B to point C..... (you get the drift) MySmartRoute from the play store does this very well but i need to use 2 devices when i would rather use one.

I'm not asking too much from a sat nav am a I?