We are likely one of those companies you are referring too that only carries basic units. Our focus is on manufacturing the best e-juice possible, and at this time equipment is really something we offer as a convenience to our customers. We do have access to the brands you are looking for and might be able to help you out.
One thing though that you should keep in mind is that 98% of smokers have never tried e-cigs. For this reason, they typically will not risk the kind of money required to obtain high end units. They have often tried those cheap and nasty Blu or Vuse units and for that reason, they just never move up to something better.
What you might want to consider is focusing on some high quality juices, and these basic and affordable starter e-cigs just to get people to try e-cigs out. Then once they see that there are better options out there and feel safe with the products...you can upsell them to a better unit. This way you are focusing on a much larger demographic, the 98% of people who have never vaped instead of the 2% are familiar with the product.
The brands you named are amazing, and as you mentioned have come a long way. But by focusing on them right now and exclusively, you are really limiting your market. It is like choosing to be IBM instead of Microsoft. IBM focused on hardware, and struggled to make any money. Microsoft focused on the software to run their hardware and made billions. e-Juice is that software, and in our opinion is the best place to start.
Hopefully you see this in the constructive way it is intended. Please feel free to reach out to us with any questions.
Jason M. Dooley