Thank you for your input. Fair enough regarding "data storage and retrieval" not requiring a performance drive, but why buy a Ferrari when you're going to drive it in a 55mph speed zone? So far as the external FireWires not being "too reliable", that has my attention and I really appreciate the heads up since reliability is of paramount importance. Actually, I run SCSI disks, but since I need and can't afford a high capacity SCSI drive (a RAID would be ideal) I have to look at lesser solutions. Interestingly, the QPS has no mention of a factory warranty, but the WD equivalent does, though only for one year. Whereas, the WD1200JB carries three years; very telling, I suspect. I'm leaning to the The WD1200JB.
Thanks again.