Your right about the Hitachi reliability. You really can't tell. When one goes on you, then you know. As for performance, according to most reviews, the new 7K250 is the fasters on average.
As for the Deathstars, that was the pre 120GXP. I think anything on or after 120GXP is fine. Like, 180GXP, probably still IBM technology, but pretty stable, with sold performance. I think Hitachi's footprints were on Model 7K250, where you see a increase in performance over its predecessors and competitors.