Just from my experience.... I loved the MVP with the iclear 16B and 16D. I still needed more and bought a mech mod and an RDA. I have done a few safe builds at 1+ ohms for the MVP and with the RDA I did not "get it done" meaning it was not enough power.
For an RDA a mech mod or a stronger variable voltage would be the ticket.
As for the RDA I LOVE the Helios. It was really easy for me to build on. I bought the Infinate clone and it works like a champ. It was built correctly!
Now for my rant. I got the Ehpro Helios RDA Clone [Black] to match my Stingray x. What a piece of junk. The screw holes are crooked, and the screws are really loose. The bottom post is crooked as well.
good luck! hope this helped!
Regards,