Would not agree with your thoughts on the memory. The CPU's native support is DDR3-1333/1600. So unless you fine-tune and tweak everything, the result in performance will not be that noticeable. And having a surplus in memory itself can be quite handy, I have 8 and I have to say I am struggling a bit at times when I suddenly want to run a memory heavy game and have a billion tabs open in a browser. Makes games with poor optimization(Or a ton of separate objects) run better. For instance X3.
Not sure how it is on the US market, but here Cursair PSU's are quite.. eeh fishy. Cannot say much on the EVGA PSU line. But for something reliable I would have suggested the Seasonic Gold series. Very neat and modular PSU's.