I just purchased a Dell desktop with Ethernet interface built in but I have Wifi in my home. Dell told me I could get a wireless adapater so I would have wifi to this new desktop...I am a bit confused, so many different specifications/prices...what should I be looking to get? Will the usb adapter work fine? Dell tech told me they run about 10-20 dollars. I don't want anymore wires or cords because of how my room is set up. Thanks.