There are so many eGo type batteries available, I have to admit I've become a Joytech snob. At least I know the vendor is stocking a specific item and not what was the best bulk deal coming out of China that week. I'm not so picky about Vision Vivi Novas, although a lot of people are.
My opinion is that you need 2 batteries, a charger,
juice, and then as many types of small delivery systems you can afford. A kit that comes with a vivi is nice, but what if you want to try another flavor? One that comes with clearos is nice too, provided you don't use any "tank cracking" juices. I'd like to see kits come with a vivi, a pack of CE3s (small, and apparently can survive strong juices), a clearo, maybe a Kanger, whatever - you never know what you will like and it can be frustrating if you are limited to only trying one flavor at a time.