Just bought a v Three last week and I am so far very satisfied with it. This is the first Prius that We've owned. I was very surprised however that the v Three didn't have DRL or the auto headlight options which are standard in my 2000 Toyota Sienna LE. I consider DRL to be essential for safety reasons and the "auto" headlights are just convenient. Apparently these options are available only with the v Five. I wonder if these features are so expensive so as to have them only in the top model? Does anyone lese find the lack of these features to be an issue?