Re: navigator as first car
Any large vehicle is a good starter vehicle. I know some might agrue that it's best to start small, but when starting with a larger vehicle the driver is less prone to do idiotic things (things that can be done in a small lightweight and maneuverable car. Larger vehicles take longer to stop, and you have to pay more attention to your surroundings.
If a Navigator can't be found in reasonable condition for the price, there are a slew of used Expeditions on the market that are just as good and for the same money you could get a 2004-2007 Expedition. Possibly lower insurance also....
The only downside is depending on the personality type of your daughter, filling up the vehicle with 3-6 friends might not be a good idea as she can easily get distracted and a large vehicle isn't as forgiving as one that's say, more narrow. If she can gab, and pay attention, then I say go for it.
I never had a first car either. I bought a 1990 C1500 GMC 5.0L V8 pick up. I now own two cars, a truck (SUV body on frame), and I'm licensed to drive anything on wheels.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!