If you recently put off snapping up some external storage, consider it good timing: Western Digital has refreshed its whole My Book line. While a 1TB option is now out of the picture, the external hard drives are still available in 2TB, 3TB and 4TB versions, although the Mac varieties are capped at 3TB. They retail for $130, $150 and $180, respectively -- in comparison, the original 4TB d
