In the following I'm using altsmoke as an example source just because they were convenient. Other vendors carry these products as well.
For instance, an eGo twist lets you try variable voltage, though is definitely larger than a normal cigarette. In that case something like:
AltSmoke.com | Personal Vaporizers | Electronic Cigarette | Ecigs | AltSmoke.com | eGo-C Twist Battery
with its charger:
AltSmoke.com | Personal Vaporizers | Electronic Cigarette | Ecigs | eGo Series - USB Battery Charger - eGo-C - Starter Kits
And, if you don't already have a USB power supply (I just use a spare one from a phone):
AltSmoke.com | Personal Vaporizers | Electronic Cigarette | Ecigs | eGo-C - USB Wall Adapter - eGo-C - Starter Kits
The above gets you one fairly low cost variable voltage PV (I'd go for the larger of the two battery options).
Then you have to pick what to use on top of it. A lot of people like clearomizers (a combined heater and eliquid storage piece, using no polyester filler). For that eGo twist PV, I'd recommend staying in the 2 - 2.5 ohm region, as using real low resistance (< 2 ohm) will tend to run into current limits of the ego (you wouldn't be able to try higher power).
I personally prefer standard cartomizers (that do use a filler to store the eliquid). I know nothing about clearomizers, however altsmoke has some here:
AltSmoke.com | Personal Vaporizers | Electronic Cigarette | Ecigs | eGo/510 Clearomizers
For cartomizers, altsmoke has:
AltSmoke.com | Personal Vaporizers | Electronic Cigarette | Ecigs | Dual Coil Cartomizer, Single Coil Cartomizer, eGo Cartomizer, Boge Cartomizer, Smok Tech Cartomizer and even Clear Cartomizers!
In filler based cartomizers, I really strongly recommend trying the Ikenvape ones:
https://www.ikenvape.com/searchresults.asp?cat=1835
Either the "Diamond" or the "Platinum std 2.5 ohm" cartos would work nicely with a twist.
Now, the "punched" part. To just use the cartomizer as-is, don't get punched. Punched just means the cartomizer has one or two holes in the side of it, is for use within a separate tank, something that holds more eliquid, surrounds the body of the cartomizer.
The tank that I like, personally, is the notcigs M1A1, but I know there are other good ones too, just my preference because it's worked well for me, consistently, for 18 months.
Assume you skip the tank and punched cartos for now (you can try them later), you now have a variable voltage PV (the twist), with some decent cartomizers (or clearomizers). Then you have to pick your own eliquid to put into those cartos. A lot of decent choices are out there. For fairly low cost eliquid you might look at what madvapes or vapor4life/v4l has. If you go to Ikenvape, he has some pretty solid eliquids. For made-to-order eliquids, generally a bit more expensive but some really good things, look at backwoodsbrew or kickbassvapor (and there are many other good options).
