BTW WD seems to have a clearance on 8TBs. Maybe they're older, or they may be phasing them out? $229 each for an 8TB Red Pro. That's still $1K for the 4 drives I'd need. :/
Lastly, can you recommend a good NAS? Maybe one with room to grow?
Also, I take it that I probably shouldn't run anything from the NAS directly? For example, a movie.