Get yourself a decent soundcard - you're already knee-deep into this, you might as well pony up for a better soundcard. Also, if you're planning on adding a TV card get one NOW and an amplified antenna. Do it sooner rather than later. If you decided to add it later, your going to have more work to do.
In addition, I hope that
wifi usb stick can take an external antenna. Depending on where your PC will be buried, the wifi will have degraded performance due to its location if its under some panelling or under some carpet. Thus, the antenna.
-HD
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