That leaves only the Vantec unit I guess. Anybody got any experience with those?

Not likely. They were just announced on Vantec's site last week. For the Q Technology supplies, I haven't made up my mind about those. But, the reviews I'm reading on the Vantec supplies by other sites are looking very good. One of them rated the Vantec 520W at 32dBA under load when not installed in a case.

That said, I think that when I am ready, I will begin with that power supply. But this will by no means be very soon. I have other things that need attention first.

If you're interested, you can find the reviews I read about the Vantec supplies linked to from this page on their site.