Specifically, buy the SYBA SD-CM-UAUD. The SYBA is one of the few USB audio adapters that works with Hackintoshes "out of the box". You don't need to install any extra drivers; just plug the SYBA into your computer, and the audio will be ready to go.
In terms of sound quality, the SYBA actually does a decent job. At least, it still offers better sound quality than VoodooHDA. And better yet, the SYBA is available from most online retailers for less than $10. If you're having a hard time working with the sound on your Hackintosh, this is definitely the easy way out.
When configuring the SYBA for this first time, you may have to open the System Preferences app, go to "Sound", and choose "USB Sound Device" in the "Output" section. However, this is the limit to what you have to do to set up the SYBA.
SOURCE: USB Stereo Audio Adapter Works with PC and Mac System