Sorry I took so long to get back to you. Just moved into new house and sorting boxes, etc is a pain.
The rest of the build is fine, especially if you like to mess with 3d as the multicore will really help that. I still think 1600 is plenty fast for what you will be doing, unless you get heavy into 3d and/or video rendering. If you think that's in your future, then by all means go for the faster ram - just stay away from spreaders.
As far as the power supply goes, my favorites are XFX and Seasonic. For XFX, either of
THESE would be great - the one that is more expensive is modular (which I like). For Seasonic,
THIS or
THIS would be my choices. If you want to stick with corsair,
THIS is a great psu.
I will ALWAYS spend a little more on my psu - I would rather invest an extra $20-40 in a quality psu than risk losing my m/b, cpu and gpu if the psu goes south.
Mark