The mini tanks are awesome. I have been using two of them with my kit. also been using the "low res" (whatever that means) catos, they will produce way more vapor. you might want to look into changing your nicotine level as well if you still cigarettes.
I was a heavy smoker, I use the Halo G6 (std batt, low res cartos, two mini clearo tanks) outdoors, but at home I use EGOs with protank mini2 on them (I have two sets and I rotate, waiting for my VV to arrive but that is besides the point).
regarding the eliquid: I am looking myself. I was not able to find a malboro substitute (believe me I searched) but what worked for me is using a few tobacco flavors and a few fruit flavors.
Regarding the PG: you can order from MTB or JC Oak, and many others 100% VG, however (and here is the Big but) VG is dense, so you will need the mini tanks eventually as I don't think the Halo G6 will deal with 100% VG (vegetable glycerin) very well. it works (I use them in their minis), but from my experience with other small tanks they probably wont last long (the Kanger Protank Minis on the other hand are Entirely rebuild able (by Anyone) and easy to clean - just be gentle on the coil).
My "Quest" to find Malboro substitute is on
http://www.e-cigarette-forum.com/forum/new-members-forum/508902-cannot-find-good-ejuice.html , but I think I summarized everything above (minus the entertainment and the rough exchanges

)
Broke up with the Marlboro man... had a one night stand with Blue...followed by a 3 week fling with my Halo g6. Basically, two strikes... but I want to stay in the game. Finding out pg does not agree with me. Ordered from Virgin Vapor 100% vg. I am looking at the ego vv in 650 or better. Would be nice to get through the day on a charge. Looking at glass mini tanks... hate filling and priming carts all day but worried about keeping a tank in my pocket or purse (heard they can't lay flat.) Can someone advise on a sleek set up that is somewhat discreet to keep the other "bleacher moms" from gossiping?