Mac Pro shuts down after setting up RAID (HELP!)

So, I recently purchased a rev 1 Mac Pro and decided to setup a RAID using 4 750gb WD drives. I am not using a RAID card, simply using Disk Utility.
I first combined drives in bays 1 and 2 (striped) and then combined drives in bays 3 and 4 (striped) to give me essentially two 1.5tb drives.
I then created a mirrored RAID using the two striped raids so that I would have the speed of a striped RAID with the safety of a mirrored RAID.
Once I did this, it showed up as one hard disk on my desktop (I was booting with an external). I then cloned my external drive to the new RAID disk on the desktop, and did so successfully.
However, now when I try to boot from the RAID, it chimes, the Apple appears, and then the Mac Pro shuts down. I tried holding down option and all 4 drives appear. I tried booting from a different drive, and the same thing happens. I should also note that the firmware bar flashes on the screen before shutting down (looks like a really long pill).
Any ideas? Does it sound like I did something wrong? I hate to start from scratch, as it takes all night to clone my external drive to the Mac Pro. Thanks for any help.

Hello, Hatter. Thanks so much for the information. I went with the information from the Macworld article (I believe) "RAIDing the Mac Pro" and according to it this setup was supposedly a great idea. But, yes, it's not working out so perhaps not in this case.
So, I have four brand new 750gb Caviar Black drives installed. If I understand you correctly, I should stripe 3 disks together, then use a 4th as backup (using Time Machine?). So, if I use the drives I have, I'll have a striped configuration that gives me 2.25TB of space, and a 750gb hard drive for backup. That technically would work for now, as I have about 660gb of data on the system (although in the future I'd need to swap out that 4th drive for a 2TB.
So, if that is what you're suggesting, would you mind telling me exactly how I do that? I think I understand, but just want to make sure as this is my first Mac Pro and first time setting up a RAID. Thank you so much for your response.
p.s.: I'm guessing I'll need to do a fresh start and clone my external drive all over again, correct?

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