The mileage thing is definitely a concern, it sounds like I'll likely be replacing the vehicle at around the same time that it is finally paid off. 30-40k/year for 5 years is likely at or near the end of the service life (I'm guessing). A Suburban would be awesome, but I think it would be a little over budget.
We don't have kids yet and I can't really think of a scenario where we'd have other adults with us. That being said, I kinda like the idea of 4 real doors. I'm 6'00"/170lbs., so I'm not huge, but I'm not exactly short.