Looking to switch from Aegis Hero 5 to a RTA/RDA

Currently using the Hero 5 with 50mg nic salts, .2 coil at 50watts. I know my nicotine use is super high, gonna be tapering that down a bit. I'm looking for recommendations on RTA's or maybe even an RDA, and what mod to get. I'm just looking to buy prebuilt coils for now as I don't have the time to make my own......I just don't know which ones to get as it seems like there's a million different variations. Also, what mg freebase liquid would be a good starting point for tapering down? thanks!