Howdy J,
I started 1.5 months ago and after long discussion here's what I did. Ego 650 twist, vivi nova mini, charger wall nodule, USB charger cable, a couple of juices, and then doubled everything. That was the suggestion, here's why. If one charger goes out, what then? If your battery dies, then what? You don't know how fast you'll go thru juice, but it will be faster than you think. If you try to charge a battery and it won't charge, is the battery bad or the charger. If you have 2 you can try the other charger, or your second battery on the same charger. Now you would know what's bad, the charger or the batt. You jump up happy to know its only the $7 charger and in your joy, you knock the vivi off the table and step on it, breaking the tube, now what?
I know it seems like overkill, it was actually suggested to me to have 3 batts, cause when one does die ( notice I said when and not if), then you only have one battery ( if you buy the twist), and a habit that needs to be fed regularly. Actually happened to me, ran out and bought a lavatube to use as my primary and the twist as backup. Most of the stuff you buy, you will continue to use either as your primary or a backup, so it's not really a waste of money. Just a bit bigger of an expense to get started.
Good luck my friend,
Big Mac