i do want it to look like a cigarette actually
Almost everyone says that when they start. Very few people who are still using a vaporizer a few months later still feel that way.
It would be nice if we could get something the size and weight of a cigarette which would let us vape all day, but it simply doesn't work. Battery size (and weight) is the main limit.
Even if you make a PV small enough that the battery and cartomizer are cig sized, it's going to weigh a lot more, due to the battery and liquid. A cig has a signifigant amount of air. A battery and full cartomizer have essentially none.
And a battery that small doesn't last for long. Comparable to 5-6 cigs, maybe? That's a pretty wild guess. So you need a lot of them if you're a heavy smoker who plans to use them all day. And you need to recharge them all, regularly. That many recharges means you'll wear them out and replace them a lot.
All in all, while most people want something like that when they start, the ones that try it soon learn the disadvantages and move to a bigger battery, usually a manual. Manual means "It has a button I have to press when I want to vape". As opposed to an Automatic, which is supposed to sense when you are drawing on it and turning itself on/off automatically. The Automatics seem more natural, to people who are new and haven't actually tried them. But the manuals work out better, and almost everyone who has been doing it long uses manual batteries.
For what you say you want - small, cig sized, looks like a cig, acts like a cig, you can find something called a Blu.
Electronic Cigarette by blu E Cigarette - Starter Kit White - Starter Kits
I don't recommend them, as I don't think you'll be happy with them. I know about them because I've seen a lot of people say "I bought a Blu, and I'm not happy, so I want advice about a better PV". But if you are set on what you described instead of what has shown to be successful, that's the place to start.
I figure if you try them, sooner or later you'll be back asking for more info, and if I see your post then, I'll tell you to get an eGo with 1000 mah batteries, a few cartomizers, and a couple of atomizers and tanks.
Good luck.