Id go with the 01. The savana was new in 99 so they had some bugs to work out of them. 01 is a good year. They all have the same engine options so there is not much difference in drivetrain. If all options are the same then the 01 will most likely have the best resale. Try to find one with low miles because that is going to pretty important considering its age. For resale I would stay on the minimum with options, most people buy these vans for work use, keep that in mind.