Xbox One headset for $40 at Dell (includes the $25 adapter for other headsets)
https://accessories.dell.com/sna/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=A7605127&dgc=CJ&cid=47997&lid=4279734&acd=10550055-1225267-83aa7b6d63864c73bec0da3873008521
4TB external drive for $100 if anyone is looking for storage for their Xbox One
http://www.ebay.com/itm/SAMSUNG-D3-Station-4TB-USB-3-0-3-5-Desktop-External-Hard-Drive-STSHX-D401TDB-Bl/291274747882?pt=US_External_Hard_Disk_Drives&hash=item43d153efea
You only need one of em. It just depends which version of the OS your Xbox shipped with. Watch the video, I believe it says to pull down both triggers and buttons during setup to check what version you have.
Yeah, here's the link to download it:
http://support.xbox.com/en-US/xbox-one/system/offline-system-update-diagnostic-tool
You'll most likely need OSUDT1 and a 2GB flash drive.