For years I use the computer to edit music for me, customers, and friends.
When I bought my new computer with one Asrock fm2a75m pro4 + with ALC892.
With my pre-amp intput connected on the back, seriously I was thinking of buying a new sound card, until I have connected the output for headphones.
Given the set of amplification and speakers and cables have mounted even for spindif
I see no reason for you to spend money to buy a sound card dedicated to music and games, even for home audio editing.
The TI® NE5532 chip with ALC892 are almost unbeatable.
Check the electrical installation of the house, the power supply of your PC, and that is connecting the PC.
Don't need to spend a lot of money start by a dedicated amplifier, find one like this!
http://www.whathifi.com/nad/d-3020/review
and take all the juice ALC892.
Do not forget to buy decent cables, to avoid jitter and packet errors.http: //www.audioquest.com/fiber-optics/cinnamon
And in the case of CDs to listen on your computer, try using
https://www.dbpoweramp.com/cd-ripper.htm to extract the tracks, they will notice the difference because no longer have jitter errors, or lost bits of correction and others maladies.
If you use a lot of usb connectors use filters.