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just get any gig nic card pci-e/pci. pretty cheap to get one and works great. I recommend intel brand. I have a new dlink pci gig nic card that i have laying around i can sell to you if you want.
If you do ethernet USB the network is limited to 100mbps if you need to transfer within the network it will suck, unless you go for the usb3.0 ethernet adaptors
Wireless AC will work only if you have AC router and all your wireless devices are on AC other wise its useless
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