Garmin nüvi 1450LMT 5-Inch Portable GPS Navigator with Lifetime Map & Traffic Updates
http://www.amazon.com/Garmin-1450LMT...6956089&sr=8-1
Love it! Have also used a Tom Tom and a Magellan but really like the size of this and the lifetime updates. Lane assist is also very useful and helpful. The traffic feature isn't really all that helpful- maybe someday it will be- and I don't have a bluetooth phone. However, I really love this GPS.
A GPS and XM radio are musts for travel!
Yahoo Maps, Mapquest and GPS units can be inaccurate- you pays your money and takes your chances. However, with a GPS you have options, with printed directions from YM or MP you're SOL.