What RAID should I use if it will be doing a lot of writing?

First of all, I'm a Photographer who would like to get a Pegasus R6 and I would like to keep all my current work(2 months worth) on the R6 and edit from any of the 3 iMacs I have at any given time.  There will be times when all 3 iMacs will be using files for editing in Photoshop at the same time. So I am wondering what is the best RAID to use?  Do I just use RAID 1 and have not only it mirrored on the R6 but also run a backup via time machine using a FireWire 800 drive or should I go RAID 0 with only 1 FireWire backup?  Is RAID 10 even good for performance wise?   I am not concerned about the space as I only plan to have 1TB-1.5TB on the drive at any one time as I rotate my work out.  Once it's done and the clients order I offload the files to 2 different drives and store them in 2 different places. 
I just want to get the most out of the R6 as possible and am wondering if there will be much of a performance hit if I stick with RAID 1?  I do realize 2 of my iMacs will be limited as they will be accessing the R6 via the wired network but the main iMac does most of the work anyways.  I just want to be sure that all 3 iMacs opening images and editing images in Photoshop all at the same time when connected to the R6 will be working as fast as they can. 

Some processes are critical, but many can be interrupted without any problem.
You can monitor your ongoing processes by going to Applications/Utiltities/Activity Monitor; pay particular attention to Disk Activity and Network. To interrupt a process, highlight the process, and tap "Quit Processes." This will interrupt or stop the runaway process.

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