I also voted for the Volt. IMO, it sets a new standard for how a high tech vehicle should look. The '04 and up Prius rendered the back seat useless for anyone with any height. The new Insight will suffer from the exact same problem given that it is basically a carbon copy with some tweaks to the cosmetics. The Volt looks like it should at least have the hope of fitting adults in the back seat.
I want to like the design of the Volt. Actually, I do like it. But I just can't see myself driving that around. It seems too overdone. I'd feel a bit awkward. The Insight is fairly simple enough though.