Welcome to Vapor Talk Ethan! You found a great place. We love answering questions around here.
I would definately disuade you from purchasing a blu. These units have a very hit-or-miss reputation - mostly miss. You will find that most experienced vapers will recommend a Joye 510 kit for your first experience. It's a quality device with a solid reputation. You'll get consistent results with plenty of battery life as you describe that. You can find these in the Suppliers section on Vapor Talk.
The cartomizers (the 'filter' unit that includes both atomizer and cartridge) like those used in the blu are okay, and for many they are desireable due to the reduced maintenance vs separate attys and carts. But with this convenience you sacrifice a Lot of affordability. You will find that refiling carts, or better, direct dripping onto the atty, is far more economical and provides a more consistent vaping experience.
Take a look at the video section in the forum. You'll find many product reviews and helpful instruction for newbies. Others will come along shortly to give you more and better advice than mine, so keep reading. The folks here all want to help you succeed in your new, healthy life. Good luck and have fun!