I would change asbestos advice a little bit.
I agree completely about the Nautilus Mini.
My disagreement would be a generic Istick.
I would recommend mods such as
Istick60tc
Cloupor Mini Plus
IPV D2
Wismec Presa (the one that uses the 18650 battery)
Evic vtc Mini
All five can do up to 50 watts, all of them can do Temperature Control (TC). The IPV D2 can fire all the way to 75 watts.
If the Original Poster (OP) decides he wants to get into Sub Ohming, TC, or rebuilding RDAs or RTAs he has a mod that he can use a long time no matter which route he chooses to take.
Nothing worse than starting with a battery that is cheap then a month later he wants to do sub ohming, TC of rebuilding and be told. Sorry but your battery isn't capable of doing that so you have to buy this. I say spend money on a good mod and good 18650 batteries and it may be all he ever needs.