I have the 2000 Honda Insight and a 2008 Toyota Prius. For trips that have a lot of city driving I find that the Synergy system of the Prius is better. For drives that have a lot of highway driving the Insight's IMA system is better. The situation that you are describing and the choices that you are offering makes me lean toward Prius in your situation. It seems optimum for the Plug In Prius which isn't of course, available yet.