My suggestion is use another older computer for your non-video and non-photo apps. That way you can minimize the processes on the video/photo machine and obtain maximum performance.on it and have maximum security and safety on your Internet/business machine. If you want a common keyboard, mouse and video display get a KVM switch like I am using. One of the biggest problems I see in analyzing the PPBM4 results that I get regularly is way to many processes/services running on machines people are trying to use as editing machines.
I second Bill's remark. For the rest you should have a fast machine that handles AVCHD without problems. You have done your homework and I have no suggestions or remarks for this new machine.
I'll run with this. I think I'll save a few bucks and get the Caviar Black's instead of the RE4's for the RAID.
Thanks for your feedback,