Two months ago I bought a Q Technology PSU.
Man, that was a BAD psu! Not bad in the sense of not providing stable power, but because of the NOISE. I swear, it made MORE noise than my original chieftec PSU that came with the case. And not just a little bit more, it was VERY noticable.
So I returned it. I don't know of this was a typical example of a Q technology PSU, but it sure as hell didn't leave a good impression.

So for now I'm still working with my chieftec psu (which is pretty quiet by itself really)

That Vantec PSU doesn't look half bad, it's an option for me too. That or an Enermax PSU. What I like especially about the Enermax PSU's is that they have a Fan Speed Adjustable Knob on the back.
They're supposed to be *very* quiet. Then again, so were the Q-technology's