I also plan on having one system drive and two other drives in RAID1 for my video editing/conversion. Can I get some feedback on which board to go with and why since they look very similar to me? Also, is one in particular more stable than the other when it comes to overclocking?
Personally, I would go with the Gigabyte board. I've haven't read too much on the P6T but the Gigabyte board has been reviewed as a board that is easy to overclock with, both for beginning and experienced users.
In terms of hardware. The Gigabyte board is also has better expansion capabilities. There are 2 more sata ports, an extra pci-express 4x slot, and the 16/16/8x pci-express slots are properly spaced. I believe both boards have power and reset switches built in so you don't have worry about that.
One major consideration is if you plan on using the pci-express 1x slot (ex. sound card), make sure the card isn't longer than the slot. It could potentially run into the Northbridge heatsink for the Gigabyte board.