I went with reasonably decent coverage through Pregressive (I stepped a few coverage options down from max, but kept the $250 deductable), and wound up with $373 per 6 mo. I did one of the mass quote things online (holy cow, I never thought the calls would stop), and Progressive and Farmers ended up being the low ones. Some of the quotes I got were over $800 for 6 mo and lesser coverage!
I'd say shop around. It sounds to me like your insurance doesnt quite know what to do with a smart. They think it's an exotic car?