Actually a Cmoy amp can go for below $30, i try to get good component for my Cmoy, and use my school equipment to print PCB board and totall cost is just around S$30. i own that HD202 before and also pair with my Cmoy, it's just nice. for this kind of entry Headphone, Cmoy is more than enough.
if you really want an amp, i can sell you my Creek OBH-11 for $120.but the best way is to invest in a good headphone first...rite??
Moderator edit:
This thread is closed as mychew has found his potential amp. Huangyong, please open a new thread if you are serious about selling your Creek OBH-11 headamp.