Dura C is a great eCig and the one that I am currently using, but it'll more than likely be replaced by my Prodigy when it finally gets here. I can say that the battery life and higher voltage will be great (used a Magnum mod at one point and loved it to death). That coupled with the fact that I can use
batteries that cost half the price of a 510 battery with twice the lifetime.
If you're looking to buy something as an initial investment to see if you like it, I would go with the Dura C.
I use a lot of JC liquids and have never had a problem with them. I know that in the past there were issues with them turning green or having a strange taste to them, but I've never experienced this. (Have 50ml of Tennessee Cured, 30 of Tobacco, 10 of Vanilla Ice Cream) I did try their Arctic Mint and found that it did indeed taste like motor oil.
My suggestion with JC is to get their sample pack and see what flavors you do like before plunging in and buying a big bottle of it.