I think you will be disappointed. The 74gb raptors have a maximum data transfer rate of 72 mb/sec.
Your deskstar is 121, and is about as good as it gets.http://www.storagereview.com/php/benchmark/bench_sort.php
Raid-0 might help some, but it generally does not, except for sequential data transfer operations.
A quality SSD is the way to go today.