Hi Alice.
For the style of Vaping you do, I think the Kanger SubTank/TopTank would be a Great Choice.
The RBA Section is Easy to Build on.
A Good Balance of Flavor and Vapor.
Spare Parts like Glass, Bases, Seals, etc are Very Easy to Find
And there are Tons of 3rd Party Parts/Accessories Available.
One thing I would Note about the RBA Section is there are/have been a Few Variations since the Initial Release.
The Original RBA (very Hard to find anymore) had e-Liquid inlet slots in the Deck. These Slots were Small. And most people running High VG e-Liquids needed to Enlarge these Slots to help with Wicking.
Then can RBA Sections that had e-Liquid Inlet Holes in the Side of the RBA Barrel. And some had Larger Holes (came with the SubTank?). Some had Small Holes (comes with the TopTank?).
Example.
I like the ones with the Larger Holes Myself. But some prefer the ones with the Smaller Holes.