In my humble opinion (that's an oxymoron) I think the best set up is to get a 2610 for the GPS. It does everything you want it to do and the price is now very affordable. Then I would get weather radar enabled on the cell phone. It works very well. Cost about $3 bucks per month.
I've done both of these things and I'm very happy. If I thought there was a better more solid soluiton, I'd get it.
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