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Here's a list I have put together and I hope it's of some use. I would not recommend a sound card unless your doing some kind of music production or have a high end headset. Also there is no need for a wired network card since almost every motherboard has onboard wired networking and since you included a wireless networking card I'm presuming you can't get wired connection making the wired card useless for you.
I would also see what Toke says as he is more knowledgeable on PC Building