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Not sure where you've seen that mugen 2 outperforms the nh-d14, but to each their own.

My bad, I thought you were talking about the Noctua NH-C14.

The D14 is another cooler, which cools just a little better then the Mugen 2 (D14 has two fans, Mugen 2 has only 1). But only by a small margin (2~3 degrees).

Same story as with the Sandy Bridge (2600k) vs Ivy Bridge CPU. Yes, better performance, for twice the price: 35 euro -vs- 70 euro...

That PSU is more than enough for the set-up I have above. Putting two 580s in SLI is a bit overkill...
The SeaSonic is fully modular and is always recommended.

Well, I rather have a quality 1kW PSU then quality 650Watt PSU, so -IF- you ever decide to buy 2 high end videocards, you don't have to replace your current 650watt PSU...

Both PSU's are excellent, so there is only the full modular -vs- 90% modular left. But since you always have to connect your 24pins cable, it's all the same to me.

It's all a matter of making choices, money saved on internal PC peripherals, can be spend on a better monitor / graphics card!