thats the first time i've heard that before.... are single cam hondas better cuz they don't bog down???

anyway, good drift car needs to be stick, running well, and in one piece. you can do an auto, but its alot like raping a kid with downs syndrome, sure it can be done, but there is no pride in it.
the SOHC should be enough to learn on. sooner or later you're gonna want to go faster. you can get a DOHC and boost it (after rebuild) or swap in a different engine (you'll find that the sr20 is popular)

if you are a fan of single cam, do that. if you like dual cam, do that. don't worry too much about how the body panels are, you're gonna end up hitting something anyway and messing up them up.

you don't have to be fast to drift, however, it does make it much more fun, once you know what you are doing.