Recently changed my systems' primary disk from a pair of 10,000rpm raptors to a pair of 7200rpm sataII Hitachi disks and here as promised is the comparison.
Note that the Raptor benchmark was taken with a very full Operating System loaded whereas the SataII benchmark was taken with a fresh install with relatively little software installed:
The 2 x 74Gb Raptors with a very full version of Vista SP1:
The 2 x Hitachi 250Gb Sata II disks with fresh install of Vista with SP2:
I think this shows that the Raptors, or improved Velicoraptors are worth all that cash.
Having said that, thus far with this install I'm noticing little difference in speed of operation.
But that could be due to the uncluttered install and the addition of Vista Service Pack 2.
I'll do another Atto benchmark a couple of weeks down the line.