I'm leaning towards a Synology DS416 with 4 WD 4 TB red drives.
Fortunately the price of this type of gear is CHEAP!! in the US. It was extremely painful to buy my Qnap and 6tb Red's locally in Canada.
At the end of the day you will almost forget that you spent that money. The convenience of a NAS system is so beneficial. I automatically throw all of my IP Camera video logs in my NAS. Creating your own cloud is "cool" but the upload limitation of your "average" ISP service will possibly drive you nuts. I still use dropbox for large file transfers.