Another one to give serious consideration to would be the Echo. It's an 808 auto that comes in 650mah and 1300mah, the single coil Echo cartomizers are fantastic, you can get CE4 clearomizers for them if you prefer. They cartos hold 3ml, work great and the battery is the best auto I've come across. Check out Cropduster901 for more info. Plus you're Volt cartos will fit the Echo. In my opinion, stick with 808's, it's a better connection.