Hi! I'm currently looking to upgrade from my iPower 80w and aspire cleito. I already have my sights set on the smoant battlestar, however I also want an RTA so I can start building my own coils. My budget at the moment is about 75$, that being allotted for the battlestar (~$40), two 18650's (~10), and then the RTA. That leaves about 25 dollars for the RTA. I would like suggestions on what a good rookie RTA is. I was looking at the Serpent Mini, because of its good reviews and included prebuilt coils and cotton. What are some other good RTA's?