There's not really much benefit to blacks over blues other than the warranty being longer, and sometimes that extra warranty isn't exactly worth the premium. I think that's the only main difference anyway, haven't spotted much done recently comparing them. Video idea? WD colour roundup? Maybe stick some other HDD "types" from seagate, HGST etc in there?
If you live near a Microcenter you could save over $40 mobo processor bundle, or you could upgrade to an 8320 and still save some. They also sometimes have open stock that will save you even more.