Anyone using them? I'm looking at the Scorpio series 5200rpm, with 8MB cache. I wanted the 80GB, but Newegg keeps bumping the return-to-stock date back further. The 60GB is in stock, so now I'm thinking about that one instead... My big concern is after reading the customer reviews about the W-D drives, about half the reviewers complain about a "clicking" noise when the drive is accessing data. Is this a longevity concern?