my 2 cents:
I am new to vaping. I have only gotten a few puffs off of one BUT I have been studying for hours a day for over a month now and I am finally going to make my move. After a lot of looking around I decided that KGO is the best ecig for beginners. It has the best batteries for the lowest price. I was looking at Hoosierecigsupply's KGO system which came with cartridges that were prefilled with crappy ejuice of low to high nicotine strength and I knew that I'd be throwing those out or maybe holding on to them for when I am out of juice and all hope is gone.... My apocalypse nicotine

So I went to get it from hoosier today and by the gods they were sold out of all colors but pink! I called him up and he was ok to talk to but he didn't seem confident of when he'd get more, 3-4 days and then another 3-4 days to ship... nah I need vapor now.
I did some looking around and I found Dark City Vapors. Even after all that research that I did I STILL had some questions. I looked down at the bottom of their screen and there was a chat instantly button! I ended up talking to Bill the owner (for over an hour) and the guy was a saint! He answered any and all questions and even tossed back a few comments that were completely unrelated to the order. He wasn't there to take my money he was there because he was a nice guy and he enjoyed chilling with vapers. I had to go for a while and came back at 3-4am and there he was and he answered even MORE of my questions. This dude's commitment level is astounding!
Anyway, I ordered my KGO from him which was the same price as Hoosier but there is a big difference. DCV has a SLB KGO kit that comes with cartomizers instead of atomizers and cartridges you'll never use. The standard kit comes with 5 SLB Standard Resistance XL cartomizers for free and for 4 bucks more you can add a 5 pack of Boge or Smoktech cartomizers for a total of 10 cartos to start. Everything else is the same - the charger, the big bore cones, the 2 x 1100mah batteries. If you order a 5 pack of extra cartomizers from him they come with 5ml of free juice too which is win. It's a great way to try different flavors for free while you get a great deal for the stuff you need. Bill is the man. If you order from anywhere else you are getting ripped off and you might make a mistake. All orders over $65 get free shipping too, so throw in a few extra cartos, get some juice (which costs half the price of all the main sites) and save the shipping with your KGO. Also use coupon code: ECFDCV for 5% off your order. The only negative thing I can say about the experience is that his site is not the most descriptive thing in the world and you should ask if you don't know what's what before you go spending money on something you don't fully understand. Hope that helps. Sorry for the length I got excited.