It's really hard to say which base anyone will get until you get to class. The open bases change pretty much weekly.
As for pay, it depends. You can get a 4 night run that has 8 hrs of flight and 14 hrs of duty time and make about the same as a run that has 5 shorter nights.
As for the Navajo or Van, I really don't know them all. But I think Richmond, Bradley, Teterboro, Columbus, and Detroit all have both aircraft.
Some other van bases are St. Paul, St. Louis (I think), Omaha, Milwaukee, Memphis, and I think Birmingham has one or two. I'm sure I missed some.