[azraelswrd]

If I were in your situation, I would just drive what my girlfriend wants and I'd just HM the heck out of whatever I was driving with that SGII (assuming you have one). Not sure which version of the Aveo you're looking at (hatch vs sedan) or the Prius (std, base, touring).

But I'm not sure if the Prius is really that much roomier than the Aveo in terms of cargo or personal comfort. Looking at the specs there isn't that much of a difference (thought Prius is bigger in nearly all inner dimensions except height) -- if you're tall you might not like either car.