GPS Units

I would suggest a Garmin 200w (wide screen). We had gotten two for Christmas but were stolen out of our house, along with a 30 case of monster energy...so really watch out for theft. Even if you take the GPS out they see the circle on the window and they will tear your car apart looking.
We just got my brother another one last night for his HS graduation. He absolutely loves it, it isn't the best there...but for 250$ you can't beat it. It really is a nice unit that has all the features you would ever need. The guy gave us a breakdown of the three brands they had for sale there - magellan, Tomtom, and Garmin.
Magellan - absolutely never get it, they are contemplating about stop selling it at Best Buy. They barely sell any units and they aren't worth the time.
Tomtom - They are a good unit because they have free updates, real time traffic and weather. Just the interface is a little sloppy compared to Garmin.
Garmin - Great unit with a easy to use interface, about $70 yearly update which aren't necessary but are helpful in case of new back roads or anything.
Good luck picking out a unit,if you go to any electronics store they should be able to help you. I am surprised that we got a competent salesperson, though I suppose if you go the car department (where the GPS's are usually located) the people really do know what they are talking about.