Anybody have any good input on recommended navigation units? There was a short thing in current Automobile magazine (I think) recommending a TomTom unit for around $500 that looked pretty good.. I know nothing about navigation units, but am ready to get one, so anyone with good info or opinions please chime in. I saw a couple of different ones in Sunday's sale ads in the paper too; Magellan and TomTom... Some had blue tooth capabilities and more..