Just do the bandwidth math. If your’re doing DVCPRO HD 720 you’re going to max out at 14 MBps at 60fps, at 24 fps it’s only 5.6 MBps so that’s not even twice the bandwidth of mini dv. Also DVCPRO HD is compressed 6.3:1 which more than DV. If you’re not going crazy with multiple streams you’ll be fine – even then you’ll only have to render. I would say stick with firewire 800 or faster drives. Get a SATA card for your express slot and go crazy. But with FW800 you should be well within your limits, just don;t go too crazy on dazy chaining.
We just did a field test for ESPN with 6 HVX’s shooting for a week in the mountains dumping and managing everything with one MBP using G-Drives with eSata and had no problems what so ever.
Nathan Beaman
Apple Certified Final Cut Pro Trainer
Apple Certified XSan for Pro Video Technician
http://www.urbanrhinovisual.com