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Just about any will work, even iphone earbuds, or high-end earbuds. I have tested both.
The N1 earbuds have three buttons, but most others have only one.
Three buttons is a convenience item, not a necessity. You can still skip songs with double taps using other earbuds. (But I can't skip backward reliable with tripple taps so I much prefer the original headset.)
At my age I have a hard time telling the sound quality of one earbud from another.
When buying buds, the thing that is important but often overlooked is the stiffness of the wires. I got some 60 ITX dollar buds from the TiPb store and was very disappointed in the stiff wires, not limp like the original. This leads to a lot of induced noise because wind or rubbing against clothing transmits up the wire and you can hear it.