Unless you're setting up a RAM disk you'll most likely never use 64GB of RAM. A 1KW PSU is major overkill even for 2 x 670. That SSD is not really that good - it's a generic Sandforce drive. I'd recommend something better like an OCZ Vector or Samsung 840 Pro (the two current fastest SSDs on the market). Also before anyone recommends a Xeon - you don't need it. Especially if you're gaming of any sort. Stick with the i7.
32GB is plenty even with a Ramdisk. I have never seen usage over 15GB even when encoding/rendering. I run a Ramdisk too and recommend it for, well, anything! I use it for cache, games, images and anything else I can stuff on it. You really should have a RAID set up for editing video also. I use a RAID 0 with four disks on a high point card, my Ram disk and another 3TB drive for storage when editing. Storage is the biggest bottle neck you will run into when editing. I also recommend Seasonic power supplies and in your case 850w.