When I first tried Monoprice 8320, I was surprised on how some cheap earphones can sound really good.
Since then, I tried many different earphones.
The following list are earphones that I have tried.
Monoprice 8320
Logitech Ultimate Ears 500vm
NVX EX10S
Bose IE2
Sony Ericsson MH1
VSonic VSD1S
Xiaomi Piston 3
AKG EO-IG955
Bose SoundSport
JBL E15
Monoprice 15274
Monoprice Triple Drivers
VSonic VSD2S