Yo, I am looking into starting to build my own coils and possibly purchasing an RTA. I am using an X-PRIV mod with a TFV12 Prince and spending too much on coils. If I want to start building my own coils, would it be better to get an RBA head for my Prince or purchase a new RTA? And what are good RTA's that are compatible with my X-PRIV? I am not new to vaping but I am new to building, and any help would be awesome.