muk
Senior Member
Head over to audiosciencereview.com. They use scientific standards to test audio quality of headphone amps, DACs, and more. As you don't need many features, and the audio quality is what you care about most, these tests should give you the info you need. In your situation I would buy the headphone amp within your budget that measures best. Asio4all should do well in your situation, so maybe you don't really need an audio interface at all.