If you have 750$ to spend and never get lost in America, then this is exactly what you are looking for, an all in one GPS system with bluetooth and flash memory of 30 gb, with some of the inbuilt maps from Navteq, getting lost in USA or Cannada (important cities) will be hard. Additional 60$ a year will get you live traffic details, making your trip safe and comfortable.
It is not only a GPS system but it also have playback capacity, FM and SD Card slot.