Howl - I'm a bit of a nerd in this area so can see that you've made some great choices.
I would totally disagree with your POV on the SSD though. It's the SINGLE fasted upgrade to any system and you will NOT regret the extra Moolah.
Just get a Samsung 840 EVO - preferable the 250gb but the 120gb is still very good. The SSD firmware allows Caching on the ram so you basically see PCie SSD levels of throughput of up to 1000GBs.
You put your OS on there and your basic software and cache out to the HDDs.
Really for your editing you ought to be editing on another SSD too. it would SIGNIFICANTLY increase your work flow - but I understand if two SSD's is too much money - you can always add one later.
With justy HDD's - you will honestly be bottle necking you system.
Also ram - don't get the Corsair Vengeance 16GB (8GB x 2) Get the Ram on my build instead, it's faster and cheaper trust me.
http://uk.pcpartpicker.com/user/serjames/saved/2DUXWhich Mobo did you go for?
SJ