We have two 2003 civics, with 100k and 120k miles. Paid off, worth 4-5k each.
We were recently gifted a 2004 sienna minivan with 175k more. Even with more miles it is supposedly worth 7k. Maybe bc it is fancy with leather and power doors? I don't know.
We can't get rid of the sienna right away. The gift is from a dear friend who would be very hurt. They gave it so we would have a larger vehicle, which we have long wanted but never been able to justify purchasing ourselves.
We could sell a civic now and put the money in the bank. Then we would have to actually drive the van, though, and the fuel economy is awful. Currently we use the van only for bike transport, camping, or garden projects.
We could wait a few years and then sell a civic and the van, and buy something a little bigger and newer (Camry or accord maybe, or Mazda5. Having a slightly newer car will be good at some point, as we drive 12 hours to see family and the civics won't be reliable forever.
For background we have a 4 and 6 year old, h drives about 2 miles to work and cannot bike due to unsafe roads, and I stay at home and drive around town and also to the nearby city for doctors and shopping. Moving closer in to town is on the agenda for summer 2015 so that I can bike the kids 90% of places.