I would go with a 1300 Go-go or Echo both have 3 ml cartos and will last you all day with no muss no fuss! The batteries last at least 17 hours and the cartos will last 12 hrs of steady vaping.
Cropduster has the Echo and Riva 1100's Cropduster901.com
Mountain vapor has Echos Moutnain Vapor - High quality e-cigarettes, liquids and accessories.
CoolVapes has Echos Coolvapes, The home of the echo
Go-go USA has Go-Go's Go-GoUSA Go-Go Kits, Cartomizers and Chargers for all Go-go's
Nhaler has Go-Gos and Echos
Cigeasy has Go-Go's
http://www.cigeasy.com/
D and B Gold has Go-go's and Echos D & b gold has echo-e cartomizers!
They all carry these but are sometimes out of stock. The smaller suppliers usually have the best prices but have a hard time keeping kits in stock but usually have stock constantly being re-supplied with a short waiting time. I have bought from all of these suppliers although Go-go usa just went in to business and I have ordered but not received equipment yet.