Good question Mike.
I was looking for one as well, and the choice is almost as bad as picking a point and shoot camera.
I didn't want to go low end, but at the other spectrum I didn't want to fork out $650+. For my money I was looking at the TomTom G0720. Unfortunately there is now a GO730 for about the same price, trying to work out the difference. They were retailing 4 weeks ago for $600, but I've seen them as low as $480 now.
I'd be interested to know what you get in the end.
Cheers, Norm