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GPS systems for cars
There are quite a range of GPS systems for cars. Probably the best one is a style that is attached via a flexible cable. This would allow for either the driver or the passenger to access the unit. Some units provide voice direction which can be handy.
So it really depends on how often you are going to use the GPS system.
Cnet reviews suggest that the Lowrance iWay 500c is the pick of the best.
Garmin brand also appears to be a popular choice for in car GPS systems. More information can be found here: http://www.garmin.com/products/spi3/
References sources:
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Magellan offers a traffic report service for North America that may be helpful if you are in some built up areas.
A Magellan RoadMate 6000T
source: http://www.magellangps.com/products/
product.asp?segID=354&prodID=1736