Oupost.com has the Western Digital Raptor Drives (74 GB @ 10K RPMs) for $170 after rebate. I have the stock 160 GB drive in my G5 2.0. Would it be better to use the faster drive for software (boot drive) or for storage/retrieval (iMovie, iDVD, Logic, etc.)? Or will I not notice that much of a difference? I am already planning on adding 2 GB RAM ($160 @ newegg) to the stock 512. Also, I have an external 320 GB (FW400) for backups/storage. What do you think?