M..
I think mine might have the traffic features but I have never used it. But then again Im usually never in rush hour traffic. I schedule my appointments around it. I personally would go for the cheaper one. You pay extra for it to actually say the street names. Mine does, but the one I had before that didnt say the street names, it just told me where to turn, but the street name was on the map of course. So, my vote, get the cheapest one. I dont really use all the fancy gadgets that you pay extra for.
Oh, and dont leave it in your car or hide it while your car is parked. People love stealing them and will bust your window out for it. The last one I had got stolen. Make sure you can put a pin number in it so if it does get stolen, it doesnt have all your addresses available.