Excuse me, which way to the turnpike?

So, this weekend I got hopelessly lost on the way home from Lancaster, which taught me two things:
1) No one should ever drive on Route 10; in fact, that road should not even exist.
2) I need a GPS system.

So far it looks like the best value might be the Magellan Roadmate 2000. It gets great reviews, and the price is right -- I saw it on Buy.com for $159.99 after a rebate. A slightly pricier option (relatively speaking) is the Garmin StreetPilot c330, which gets rave reviews and goes for $249.99 on Amazon. Both are pretty low on the frills, but I don't need frills. I just need to get the hell out of Pennsylvania.