If you have an old surround receiver (that is not too old to have Dolby Digital) that you don't know what to do with, that would be great for running bookshelf speakers for your computer. You could use a digital output on your computer, and thus use the DACs in the receiver. Many old receivers would be fantastic in such use, even though they are too old (and thus lack current features, like HDMI, etc.) to be suitable for an up-to-date surround system. And if you don't have one, you can buy a used one quite cheaply, if you are patient.