If you want to keep your Blu's for backup ditching the expensive pre-filled Blu cartomizers will save you a lot of money. Search for "refill blu cartomizer" on YouTube for directions on how to re-fill the cartomizers you already have.
I went from cig-alikes such as the Blu to variable voltage Twists/Vivi Novas within a week and couldn't be happier that I decided to go with variable voltage. That combo produces a markedly significant better vaping experience and I've discovered that even some very small tweaks in voltage can make the difference in a few juices between icky and wonderful.
Having variable voltage means you don't have to do endless homework about ohms and resistance. Just turn the Twist down low, pop on a Vivi Nova filled with juice and then dial up to taste. If the voltage is too low you won't get vapor, if it is too high the juice will taste burnt. Lower voltage improves taste and higher voltage produces a bit warmer vape with more throat hit. Just twist the dial to get what you prefer.
This video review for the Ego Twist will give you the general idea about how easy variable voltage is to use,
The Ego Twist is a Game Changer - GrimmGreen.
This is a review of the Vivi Nova that will give you good idea of how well it performs,
A PBusardo Review - Vivi Nova 2.5
The first part of this video will show you how to clean the Vivi Nova. I clean mine after two or three fills and it takes two or three minutes. Some people just replace the heads when the atomizers give out but the last part of the video will show you how to save some money by rebuilding the Vivi Nova wicks,
A PBusardo Tutorial - Vivi Nova Cleaning & Rebuilding
To start you will need:
2 variable voltage batteries (Twists, KGOs or Vision Spinners)
1 USB charger
1 USB wall adapter
1 and preferably 2 Vivi Novas - version 2.5 or 3. (The larger size looks more like a scepter on the Twist class of batteries but hold more juice. The mini version looks sleeker but holds less juice.)
1 or 2 anodized aluminum tubes for the Vivi Novas (The Vivi Novas are more resistant to plastic unfriendly juices but someone has reported that cinnamon juice etched their Vivi Nova plastic tank and I got a note from EC Blend that their banana juice should not be used in plastic. I can't find any currently available for the mini size in the U.S. Vapor Kings and Got Vapes and probably some others have the regular size)
1 atomizer and drip tip for dripping to test juices
Sweet Vapes has a nice
Twist Starter Kit that has most of what you need.