Just out of curiosity, why a tank system? I started with cartos and tanks too, but I picked up an IGO-L for $20 at my local store and I would highly recommend it to beginning vapers (of which I am DEFINITELY one) because...
E-Juice!!!! I've only been vaping a few weeks and I haven't found a juice that I can vape on all day... I filled my tank and got sick of the flavor (sunkist from lush vapors) after a quarter of the tank. Then I bought honeydew melon, same thing... peach snapple, same thing... trying the flavor once or twice in the store is completely different from vaping an entire tank, at least for me. Plus all the stores in my area rebuild atomizers for me, so I don't have to worry about learning how to rebuild the atomizer myself (although I definitely want to!)
That being said, if you have already found a good juice that you can vape on for an entire tank, the MVP is a sick system... One of my friends just picked that up as his first vape and I'm pretty jealous!