[Chys]

For discussion please, a 421+ is $775, that is like almost x3 212j. Apart from the possibility of having Raid 5/6/10 etc... Will you be better off with 2 x 212j with spare change? Though I noted that you will lost 50% hdd space. Let's do some math:

Setup 1 - 9TB (Assume Raid 5)
1 x 421+ - $775
4 x WD Red 3TB - $207 x 4 = $828
Total = $1603

Setup 2 - 3TB x 2 = 6TB (Assume Raid 1)
2 x 212j - $270 x 2 = $540
4 x WD Red 3TB - $207 x 4 = $828
Total = $1368


$1603 - $1368 = $235 (ie 1 WD Red 3TB with spare change)

So in the end you get same diskspace except that in Setup 1 3TB is unprotected per se.

Any other views?