That does look nice. You could use a lower-wattage PSU to save some money (stick to Corsair, or Antec or Seasonic).
I've got one of the LED versions of that fan. Mounted vertically on the side of my case, it does whine a little, but not too bad. It moves a decent amount of air and is otherwise quiet. If you run the fan at less than 100%, it will last longer.
Yeah, I was originally going with the HX650W, but the 750 is only $15~ more expensive. (I was kind of set on getting a modular, but I'm not ordering my parts till next paycheck so I might just go with a non-modular to save some dough.)