The E-Powers are very easy to use. Some kits come with attys, but that doesnt meean thats all you can use. Get some cartos for it as well.
The eGo E-power is nice, but the only thing I dont like about it is that the switch is not replaceable on it, which is one of the things that made me like the E-power in the first place. It is a nice device though and I think youd def like it.
With the eGo-E-Power you can use a 18650 battery for 3.7V, or 2 16340 batteries for 5V. So its the same device, and you can use different batteries to give you the different voltages.
LibertyFlights sells both kits. if you look at the description of each, they come with the different batteries that I was talking about. The 5V kit will allow you to vape at 5V which is nice, but the downside is that the battery life is a lot less. (650mah compared to 2800mah) So the 3.7V batteries would last over 4x as long.
If it were me, I would prob get the 3.7V kit to start, and they if you want to try 5V you could always just buy a few 16340 batteries later so you could vape at 5V. The batteries are cheap so it wouldnt cost much if you wanted to get them later to try 5V vaping, but thats up to you.
The 5V kit does cost more, but you also get a carto tank with it, a carrying case, and a better charger.
If you do decide to get the 3.7V kit instead of the 5V kit, I would get it from here instead:
Ego E-Power Kit
Sweet-vapes sells the 3.7V kit for cheaper than LibertyFlights does, and theirs comes with a case (41.95 instead of 47.99)
They dont sell the 5V kit though, so if you want that get it from LibertyFlights.
Or if you just want the regular E-Power, this is the kit I mentioned in the previous post:
14650 Black Carto Kit
This is the E-Power that I have. Its the 14650 E-Power. This is what mine look like:

I have carto tanks on mine. You can just use regular cartomizers, but you might want to consider getting a carto tank after you get used to using it and you get comfortable with it, bc they allow you to go alot longer without refilling. I fill my tanks in the morning and pop in a fresh battery and I can easily vape all day maintenance free.
Again, I think youd be happy with the regular 14650 E-Power or the eGo-E-Power.
Hope this helps and let me know if you have any questions.