Need help looking for a gps navigation system for my car!?

I am looking for a gps system that is easy to use, has good satellite connection, and is a accurate at giving the directions. It also must have a clear good screen so that i may read it in the daylight and a good volume level. Any ideas? Thank you!!|||the local electronics store or car sales place a good gps costs around 400 dollars up to 3 or for grand