What's a good GPS device?

My parents want to buy me a GPS....thing for my car (I guess my constantly reminding them where to go makes them think I will be lost when driving alone).  Anyway, they want me to pick one out for myself, but I have no idea whatsoever about which ones are good, which are bad, etc.  Does anyone have any recomendations?

i own a tomtom, user friendly-ness at its finest

I use my iPhone these days =/