Time for Moar storage and so this time i was thinking of getting used Ultrastars off ebay vs buying new HGST NAS drives - price wise around $100 or so for 4TB ultras vs around 130-140 if on sale at the egg for 4TB HGST NAS drives. Leaning towards the ultras they are enterprise grade so should be pretty solid. I've been buying HGST NAS for the most part until recently when I bough a couple of 6tb heliums HGST used and they're pretty solid. Anyway thoughts?