...whenever you ask.
People tend to recommend the 901 and 510...but in practice *I* have found the 510 either makes copious amounts of flavorless or near-flavorless vapor...or burns what you put in it.
And it is exactly not like a cigarette
901's feel like you are sucking a milkshake and I've never had a 901 atomizer live thru heavy use.
The best eCig you can get is one with cheap consumable parts and decent battery power.
If you want the best PV OTOH, I am sure someone can recommend some contraption that is exactly not like smoking, but more like feeding a nicotine habit with crazy batteries, tubes and wires
For me, my favorite "e-Cigarette" is a Rube Goldberg mix of an L88 atomizer "the oft-maligned but seldom understood "Blu" style super mini" with it's big brother, the J108 battery.
It is the same thickness of a cigarette, about the length of a 100s and gets hot enough and makes enough "smoke" so that it is like smoking a cigarette. It is what I hand to people that want to "try it out". I have one that is configured to 'look' like an analog but I usually use my red/black DemonStik™ Combo for myself
If you are new, you do what everyone else does...you buy a bunch of stuff and find what fits right for you, but if you are like most of the first-timers I've turned on, the more "exotic" options are too far away from what you are used to, and the option that is "just like it" as other shortcomings (battery life, heat/vapor production) that it leaves you lacking...so for those people, I tell them to "get a Blu atomizer and a Sideshow battery and charger and give that a shot. it won't break you."
YMMV
-K