Originally Posted by MaloS
Correction: Edition 9, RS-1, MS-Pro do not require an amp, so I'd just put a 2.
Under more than $500 you can add an IEM section:
Westone ES-2
Ultimate Ears UE-10 pro
Ultimate Ears UE-11 Pro
Sensaphonics 2X-S
You can add Stax SR-303, 404 in $300-500 section
Stax SR-001 probably should fall into IEMs <$300
Stax SR-003 can go into the same section as SR-001 seeing how it is identical.
All of the above can require amps, but it makes sense to add that SR-001 comes with an amplifier, and all the others are generally bundled with them also.
Also Stax Omega 2 in greater than 500.
Added all of the stax phones and made a "0" option for headphones that generally include an amp.