I went ahead and installed the RAID 0 array to my system. That wasn't exactly straight forwards but it is do-able as I documented here. Hardware RAID installation after Windows 7 OS install
Now that's done I thought I should post some benchmarks for the different disks running in my system. It turns out there are differences worth considering. the 128GB SSDs are considerably faster at writes than the 64GB drives. The Seagate Barracuda is faster than the Caviar Blacks in Stand alone AHCI mode. The Caviar Blacks in RAID 0 are 40% faster than the Seagate Barracuda in AHCI for video writes.
If I were doing it again with this knowledge in hand I would have bought 2x128GB SSDs rather than 1x64 and 1x128. I would consider a pair of Seagate drives for the RAID array...my only concern with that option is that the Seagate drives are only a 1yr warranty vs the 5yr WD Caviar Blacks.
Based on the results I'd also say that using a 128GB SSD dedicated to being a video file temporary workspace would be even better than the RAID setup. Ie Edit the video files to & from the SSD and copy the source & edited files to the higher capacity storage disk when done.
This is the Samsung 830 64GB SSD (Win 7 OS Disk) C:
This is the Samsung 830 128GB SSD (Main data disk) D:
This is a WD 1TB Caviar Black disk pre RAID R:-932GB
This is the pair of WD Caviar Black disks in RAID 0 R:-1770GB
This is the Seagate Barracuda 2TB in AHCI. E: