For flavour RTAs then look at the kayfuns, taifun gt2, lemo, über toot or serpent they are all single coil, relatively easy to build and wick and great for flavour. If you can try a few clones rather than splashing out on authentics as some can be expensive if you don't know what you like.
Flavour RDAs include the derringer, plume veil and Sapor. I have and still use all three. Scour the classies or have a look at fast tech as some are very cheap for decent clones.