My recommendation re: stand alone nav unit vs. nav on the 6700 is what are you wanting to use it for?
If you're travelling a lot (by plane) and want something portable that you're going to bring along anyway, I'd say the phone will work well enough - get a cheap BT GPS unit and go. Particularly if you're talking about travelling to places where your phone with data plan will work - there are plenty of free options that work well enough - including turn-by-turn directions (just not voice commands). I went to Albuquerque for a conference recently and used MS Live nav directions with the GPS very successfully. BT unit fit in my laptop bag w/no problems and chucking both the phone and GPS into cup holders in my rental car worked ok too. Now, if you can get/use the Tytn-II that's even better with built-in GPS - nothing extra to carry along (just bring the car charger).
If you're talking about something for your car, I'd get a stand alone unit and mount it accordingly. I use BackCountry navigator on the phone for off-roading and it works pretty well for that, but if I get an incoming call, it tends to mess things up and get annoying. If I was driving on a 6 hr trip and calls keep interrupting my nav it would get annoying fast. Stand alone unit works much better for regular day-to-day use.
That's my 2 cents. I know others have used iGuidance and TomTom and seem happy enough though. I just think it's too difficult to multi-task on the phone while trying to drive to have to deal with phone calls and the nav all on the phone.
PS: I've got a Nokia BT unit that I found on clearance at CompUSA. It's about 1/4 the size of the phone and probably will outlast the phone battery. I'd get anything cheap either locally or online and not particularly spend extra for the latest and greatest hardware.
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