I was a 'newbie' a year ago, and used 'vaping' to quit my 30yrs 2pad smoking habit.
I went through all the various newbie 'junk', like most of us have. I also have bad hands so even if I wanted to learn to rebuild stuff, I can't.
If you want to keep costs as low as possible, either the MVP2, or the new iStick will honestly do the job for you power-wise. Yes, you can always spend more and get more power - only you can decide what your goal is. The Nautilus with 'BVC' heads will make a very good topper for you. Gives you choices on how airy a draw you like as well.
Then, the key is finding a juice that you really like, with a NIC level that works for you. I am still at 24mg NIC (which is on the high side) - but it's what works for *you* that counts.
You could also go the carto/tank route - you're buying new cartos instead of new heads. There is about as many power choices as there are opinions. I have and really enjoy my ProVari. But when out and about I use the MVP2, and I just ordered myself a iStick.
Again, you can spend as much as you want/can afford, or go cheap with a few good items and still get a very good vape. You need to decide what your goals are here? I vape rather than smoke. My goal is simple, what is the easiest way for me to vape without having to carry spare this and spare that around with me all the time?
A Nautilus with an MVP2, freshly charged and filled with 5mls of nice juice will keep me good for 6-7hrs - I only carry a spare head, as while they usually go bad slowly over time, rarely, one will just poof! Stop firing, rare, but it does happen.