1) i would buy a 2600k less money better performance unless... you are a heavy animator
2) absolutely no need for 24 gig Ram unless... you are a heavy animator (12-16 is more than enough)
3) SSD boot drive? fine if you have money to burn, it will make windows snappier past that very little to no help with editing performance. (helps a tad with temp files, needs to be 256G minimum)
4) your drive setup is vastly overkill and you certainly do not need an areca card
2x 2 drive raid 0 (about 205MB/s) each
an external back up
oh yeah no need for a video card past the 570 unless...
I agree with Scott (maybe he's too honest, he sells great editrigs)
I just build a 2600K machine overclocking 4.4Ghz on the Asus P8Z68 V pro mobo with 1 Samsung F4 500GB 7200 rpm for windows and programs, 2 x Samsung
F4 500GB in RAID 0 for cache/preview and just 1 Hitachi 7K3000 2TB for my Nikon D7000 files (like your Canon)
4x h264 layers picture in picture runs very smooth, 7 layers pip gives a little stutter.
Maybe I will extend the PC with another 3 Hiachi's in order to make 4 Hitachi's in RAID 10.
I agree with Scott's assessments.
But if your looking for data safety, and if your like me and don't always backup regularly because you're always pushed by deadlines, I would go with a parity RAID for project and media files. But don't use the on-board RAID5, use a hardware RAID card (be it level 5 or 3; Areca, LSI or other good reputable and stable brand). You don't need 6 drives for H.264, 3 is sufficient, perhaps 4 maximum if you intend on reading multiple layers of video off the RAID. Just remember, with H.264, your CPU will be the bottleneck to decode multiple streams of video for realtime playback. Also, for your cache and previews, get a 2 drive RAID0.
On the other hand, if you're in no hurry and you are very keen on doing regular backups, stick to Scott's 2 RAID0 sets of 2-drives.