Not to be factious but your recommendations are horrible overkill for a DV system, if I was intergrating a system for SDI throughput I might use some of your specs, a simple ATA150 SATA video source drive is sufficient for 3-4 streams of DV video.
A decent configuration for DV/DVcam is a system/apps drive ATA100 and up, an AUX drive ATA 100 and up for previews, sound, cache, misc clips, and a large SATA I/II drive for source video, As for the original poster who had stutter problems, drives could contribute to his problem particularly externals, also other things like backgroung programs, TSRs, and active drivers can cause the same problems, as we don’t know the configuration of his system and what he has on it, expensive recommendations are counter productive.