yeah, thats basically it.
90 and older are SOHC and basically suck balls.
if you like flip up lights, the the s13 is the way to go.
if you're not such a flip up light fan then go s14.
the differences are basically just body stuff.
the s14 has more/different sensors but thats about it.
look for a straight frame, no rust, everything works, and a 5spd is always nice too.
good luck and have fun
let us know how it goes