Adam, instead of driving yourself nuts about what to get (which I did myself before purchasing) figure out what you need your device to do . Do you want to be able to vape your brains out without needing to recharge mid day ? Since your budget is $50.00 is that for now or do you plan on spending considerably more in the future ?
Those are the questions you need to figure out, for me , I did not want to keep upgrading, all I wanted was an idiot proof device (since I have been known to be an idiot at times) and I wanted something that would last a few days between charging , everybody I asked said skip the Ego stuff because you will end up purchasing a superior device again shortly which I didn't want to do.
They told me the MVP was exactly what I was looking for and it would be able to keep me going for a long time to come , which was important to me.
Obviously my needs aren't your needs so decide what's the most important thing to me at this time , and what you think may be your situation down the road .
Many here have rooms full of vaping gear , it can get expensive real quick if your not careful , do you need all that stuff to get off e cigs , not in my opinion , all that's required is knowing yourself and what you want .
Don't be suckered in to buying stuff your not sure about or feel comfortable with , seems to me your quite cautious (or confused as hell) one of the two , which is a good trait to have , I'm sure you will end up fine.
I bet if you asked most members how much gear they bought and scrapped because it wasn't what they were expecting the # would be quite high so no biggie if you strike out at first .