Brake rotor: like what Jeffreymui said $270-420 depending on what you want.
Clutch:Keep in mind changing a clutch on a K series required a bit more than half a day to do the job price varies depending on workshop I got mine changed with clutch cost around $900-1100.
I use my ep3 as a daily at one stage it was awsome =) maintenance is like any hondas cheap. Keep in mind if the ep3 your buying the owner hasn't changed the engine mounts be prepared to change it to.