Looks good. Keep an eye on the motor oil, IIRC those 3.8's can burn a bit. That leaves the trans and/or front diff. From what I understand though, those 4AT's got better as time went on--but they are still a problem. Hopefully you will never need to--but you might want to find a jar to toss money into, just in case, that unit decides to act up. Also minivans tend to be hard on tires, so just be ready to replace often.
But--with the money you saved on not financing something much, this shouldn't be a problem. If anything, calculate what you would be paying and every month, drop that into the jar. Before long any repair will be annoying but trivial.
Good luck! Sounds like a solid score.