Creating the best RAID setup for my MacPro using FCP

I have a MacPro, 2 x 3GHz Dual Core, 16GB ram, 4 x 500GB drives and I work in FCP 5.1.4 and with my Hardware setup I feel it should be faster and I've been wanting to set up a RAID but not sure how to do it, or the best way way to do it.
Out of the 4 drives I have, Drive one is my main drive (boot drive, apps etc.) Drives (2 & 3) which is a TB combined, I'd like to turn those into a RAID) to speed up rendering, editing etc. In FCP and Motion. Drive 4 is where I keep all my working files.
My files are backed up regularly onto external harddrives and kept offsite.
Can I leave everything I have on my entire system the way it is and just turn Drives 2 & 3 into a RAID that's best for this application? People who work in VIDEO I know do this all the time to speed things up but I can't find the steps for the best way to do this. Bits and pieces all over the place but I can't put this puzzle together.
Can you point me in the direction in how to do this?
As I'm doing this is there anything I should be careful about?
Please help me understand this process.
Just in case you need to know what kind of drives I have here's the info:
Capacity: 465.76 GB
Model: ST3500641AS P
Revision: 3.BTA
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk1
Bay Name: "Bay 1"
OS9 Drivers: No
S.M.A.R.T. status: Verified
Volumes:
Startup Drive:
Capacity: 465.44 GB
Available: 367.86 GB
Writable: Yes
File System: Journaled HFS+
BSD Name: disk1s2
Mount Point: /

My advice would be 'yes' to what you are saying... with the exception of the Softraid stuff - not that I think its wrong, but I've never used it, so I can't comment if you need it or whether the Mac OSX raid is sufficient - but others here say they prefer it so fair enough. You can see some comparisons here http://www.amug.org/amug-web/html/amug/reviews/articles/softraid/351/
amug always have indepth benchmarks of stuff.
I wouldnt call myself an FCP guru, but I think that your suggestion of putting the FCP scratch disk and client, video files on the raid are the best idea. The scratch folder is essentially where the temp-rendered clips go, so its audio and video - you want that folder to be on a really fast volume. You also want your source video files to be on a really fast volume, so they can be streamed fast enough to play in realtime too when playing unrendered areas, or building a preview.
Some might say in FCP you get bast performance when your scratch disks and video files are on seperate disks. Thats totally true, so it can read from one disk and write to the other at the same time. But in your case you have a 3disk stripe, which is roughly 3x faster than either of your disks! So it would still be faster to have them all on the same stripe.
You can leave your FCP app on the sys drive, keeps things cleaner (drive1 for sys and appsm raid for data). You can keep your project files where ever you want, they're not very big and are kept in memory so dont affect performance at all. Though to stay clean I would keep it on the raid, so again the raid is for data, and you can back it up accordingly. The system drive is only for apps and system so you can back that up accordingly too (less frequently probably).
P.S. Technically your 'point 8' is inaccurate. After creating the raid you will not see drives 2,3 or 4. You will see only one 'volume' for all 3 drives. Overall your mac will have 2 'volumes': the system drive, and the stripe of 2,3,4. Physical drives and 'volumes' that mount in your OS are completely seperate. You can create multiple partitions in a single drive, or you can combine multiple drives into a single volume (e.g. using raid). But basically yes, you copy your client files back to the raid.
And remember, if any ONE of the disks in the stripe dies, you lose ALL of the data on the entire 1.5TB volume. So it is pretty important to backup regularly!!!!
(I dont wanna confuse you any more, but raid5 is a good option if you want more security and don't mind paying extra :P, you'll need more hardware for that, and more drives to make it worthwhile - but I would say skip that for now, as you can build your raid0 for free or almost free and use that until you think you need more)

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    This thread is pure irony. Whether YOU like it or not play no role in this movie. Irony or should I say the terminology surrounding it is NOT  subjective to interpretation. Like an Automobile. Just because you dont think Automobile is describing something driving with a motor and 4 wheels well, does not make it less an automobile let a lone a train or fish... Perhaps you take dislike to the automobile, perhaps because it is green, and that is your right but it is STILL an automobile...
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    E: media and exports
    System with 4HDD
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    D: Windows page file and renders/previews plus miscellaneous
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    F: media cache and exports
    Alternative suggestion:
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    E: media
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    2. That leaves media in the middle.
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