Lets see here.... Many of the folks here will tell you that 'All roads lead to Provari', which may be completely true, I think, and there is a good argument that, since it is viewed as the 'best' mod, that might as well skip the baby steps and grab the best. However, seeing as how it's $200 up front for a new hobby/lifestyle, it's a serious commitment, and not everyone can swing that off the bat. One must test the water before drinking the Koolaid.
There is also pleasure in all of those baby steps that help you appreciate the upper end of things. You would not appreciate a Mercedes if it was your first car, since your point of reference would be skewed. Start with a Honda, and you can tell the difference in quality and performance when you get that Mercedes, and that adds a level of appreciation that cannot be had by skipping over the lower end.
Now, with that aside, I will try to help. And my help for beginners like me always lands at "The first steps on the path to Provari are in the itaste MVP".. but follow my logic here.
First, features: How many features do you REALLY need in your first mod? I would say 2.. Variable Voltage and Variable Wattage, with the wattage being most important. Why? Because, you are really looking for that sweet spot where voltage and resistance meet for that perfect heat on your juice. Ohms law tells us that P=E2/R Or Power = Voltage Squared divided by resistance. So, if in the end you are looking for the sweet spot, a variable wattage mod will let you set it and forget it, as it will 'do the math for you'. Set the wattage you want to vape at, and the device will adjust the voltage depending on the resistance of your head (coil). Even if you change heads.
With straight variable voltage, you can play with it, and if you are curious, always do the math yourself and see what wattage you enjoy a certain juice at... then, do the math every time you change coils... Or guess. Whatever.
Now, of course you want variable voltage to work outside those boundaries and maybe find your own sweet spot every time. Maybe you like the taste of a burnt wick with your bananas Foster juice, since it reminds you of Mom's cooking, I don't know... But any VW APV will also have VV, so you're covered there.
Next up on the list of important features would be compatibility with different tanks. There are a couple of standards when it comes to threading and fit, the most popular two are 510 and eGo. There are others, but they are less common, and if you have these two, you're pretty much covered for what's on the market.
Now the tricky part... modding, tinkering and pushing the limits.... Maybe you have heard about sub ohm vaping and want to try... Maybe you want to be able to try different battery configurations. Maybe you need 17 different tanks with all different heads for each flavor, and you like different resistances for each, so you need an ohms meter to read the resistance of your hand wrapped coils... This is a realm that is personal to you, and since you are asking advice in this thread, you are not there yet, and maybe didn't even understand some of that... then it's time to slow down and drive the Honda for a bit longer... you following me???
So, in terms of PVs, what represents this Honda I refer to??? For everyone it's different, just like Honda has several models to choose from... but, as a newcomer to the vaping scene, I was looking for the above features (Tank compatibility, variable wattage, long battery life, not too much fiddling involved) and I wanted a good price point to get started, in case I said 'screw this, I would rather smoke or quit altogether'
For me, those points culminated in the itaste MVP. If you have the funds, the SVD is apparently better, but the MVP has everything I needed, and I will project that onto your life too, and it was only $40. Done and done.
The build quality was better than expected, the adjustment interface was even more basic than I thought it would be, and all of my tanks fit.
Hope this rambling story helped in some way.... Like I said, I am also new to this, so maybe the old timers know something I don't. But as a newbie, I started in Geo Metro land (eGo non-twist with a clearomizer).. moved to a Hundai (eGo Twist with a Protank Mini) on to the Honda I now vape (itaste with Protank 3). I already want to step it up, so I have a down payment on a nice Audi, set to be purchased next month or so (Siegelei Zmax)
I also have a little project hot rod in the garage that i take for a spin every once in a while (Kamry K101 mechanical mod with cartomozer), and may wind up going all out for that 1971 Camaro (Nemesis mech with a Kracken RDA)
Welcome to the wonderful world of vaporizers...