I taught Differential Equations once back in 2006, and I am slated to teach it again this Spring. In 2006, I was assigned used Blanchard, Devaney, Hall, and I really liked this book. However, I find that it is expensive.
Now I never took Differential Equations myself, and I don't do any kind of applied math. However, from googling around a bit, I see that this may be what is called "Reform" Differential Equations, and that it emphasizes a qualitative approach. Our SLAC has no engineers, and I suspect that this would serve our students better than Boyce & DiPrima. (But I have absolutely 0 experience with the traditional approach, so I am going on a hunch).
Does any one here know of other "qualitative" Differential Equations books like Blanchard, Devaney, Hall? Perhaps even better or less expensive?