Considering those prices, you may want to consider a low end Onkyo receiver (less than 300 Euros here), output digitally to it via HDMI, and get great sound both on headsets and on speakers.

And also possibly connect more PCs to the same monitor.

I did that two years ago (TX-SR309), and I am very happy with this setup.
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= Taym =
MK2a #040103216 * 100Gb *All/Colors* Radio * 3.0a11 * Hijack = taympeg