Hello, sorry my english. 
I have a "koss PortaPro's" and really like the sound quality of this phone. But now I want to buy a headset "In-ear". 
So I ask: 
Is there any headset "Earbuds & In-Ear" with quality "equal or better" to the Koss Porta Pro? 
Purchased a "Philips SHE9000" but I was extremely disappointed. The quality of this phone is terrible. 
Researched some models of phone, and called me some attention. 
They are: 
Shure SE530s 
Koss KDX300 In-Ear 
Sennheiser MM 70s 
Sennheiser CX 300 II 
I am not an expert on ear phones, so I would know through you. Any of the above models have the quality "equal or better" to the door of the pro koss? 
Do you suggest some other model phone ear?