Addvice needed about Amp

[Captain]

Hi

Very new to headphone amplifiers and need some addvice on which of these amps to buy with in my price range.

Musical Fidelity X-CanV3
GSP Solo MK III
creek OBH-21SE

Headphones I will be using Etymotic ER-4S

Any other suggestions would be appricated

Cap

 

[Jahn]

i've heard that Xin's amps go very well with Etys. You can wait for the supermono or get a superdual out there...