LOVE my Halo G6s!
The mini-tanks are just excellent...and they last a good while (I still haven't replaced any of mine) if you wash them out occasionally. I am okay with the LR carts, too, but I prefer them with a drip tip. Ultimately, you'll get better flavor from the tanks for most juices.
Definitely get a couple of extra batteries and always have a backup charged and ready, although I've found that mine last a lot longer than I thought they would. They are great for being stealthy at work! I find that one battery will get me through a full tank and then some (abt 1.3ml of liquid or so) before I have to change the battery.
You didn't ask about liquid, but I'm gonna say it anyway: get a tobacco sampler! Tastes vary, but I found that Tribeca and Voodoo, especially if mixed together 50/50, got me over the "hump" and made me not want cigs anymore. At all. Now that my taste buds are back in business, I really like all of the Halo tobacco flavors. Turkish tobacco (I hated it when I first tried it) is now the BEST thing in the world while I drink a beer, for example. And Tribeca/Voodoo is still my go-to flavor.
Don't be afraid to branch out on flavors...I surprised myself by really liking some sweet stuff! Try Coumarin Pipe Tobacco from Mt. Baker vapor...just a tinge of cherry flavor in it, and it can be sweetened even more by mixing it with most any fruit flavor. Branching out into different tastes has helped me get over the idea of cigarettes. I hope it works out as well for you as it did for me...congratulations!