Update: I finally got my SeaSonic X750. I can say that I'm pleasantly surprised with the absence of noise coming from PSU. Although fan does not spin at startup it eventually spins but I can tell you even placing my ear by PSU I hear no noise... What a pleasure compared to my older Thermaltake PSU.
I had also purchased a Corsair 800D case, but DOA.... and no... no user error... looks like power switch was faulty. Currently in process of RMA.
Unfortunately, now I hear noise from ATI 5870 card. Due to noise from Thermaltake PSU, noise from video card was not noticed. I'm considering now getting aftermarket cooler for ATI 5870. Any suggestions on GPU cooling for 5870 ? I will be getting Corsair 800D case, and this looks like it's more suited more for liquid cooling but a bit hesitant about going liquid cooling. I prefer air or sealed liquid cooling like H50 where there's no maintenance. I'm starting to look at CoolIt OMNI ALC (universal gpu cooler).
hmm, maybe I should start another thread for this... lets see...
Thanks in advance for your suggestions.