First you must ask, what are my vape goals? And how long do you want to vape for???
If just looking to quit smoking then quit vaping, or continue and improving your vape? The minimum I recommend to all vape curious people is either something like the Innokin VV V3 or MVP 2. Both are VV/VW, and may be all that you'll ever need. One a box mod, the other more ego size.
Variable is nice, allows one to dial in to taste. And if one decides to go the path of the rba, re-buildable atomizer, either can get started, but the MVP would be better suited for majority of rba's. Though something like the Taifun GS clone, would work nicely on the VV 3.
For me, a regulated mod was necessary, and is the safest way to vastly improve your vape and get stared on the rba path. Until I started building the Russian rba, I felt that something was missing from my vape, basically an adequate volume of vape to fill my lungs, don't have that problem anymore.
Best advice is to see what is vape possible, then decide what makes the most sense to you and fulfills your vape agenda. Once finding the style of personal vaporizer, then search for quality, and the best price, and go from there.