Assuming the 750 watt "requirement" is bogus, I'll aim for 550W and up.
As I said elsewhere (among several other forumers), with reference to your setup the only reason to pick anything higher than 400/450W is a more favourable noise profile.
I understood what you meant about the 750 being more quiet but looking back over old posts I wasn't sure if I needed more than 650 to achieve the reduction in noise. As I understand, it's mostly about the fan not running at a certain load capacity and this can vary with brands a bit. 400/450 seems too low.
Kingwin 550W (LZP-550).. currently at $135, occasionally on sale for $100-$115. On my last thread with you this was the PSU I was targeting but it has yet to come on sale. The Be Quiet is probably better, but I feel it's just too expensive.
No, the Kingwin is - more probably that not - a better PSU than the BeQuiet: they are on par about noise, so you may pick the one you may rather.
Corsair RM 650 or 750... currently $120, but sometimes on sale for $100.
In terms of noise, do you think I'd be better off with the 650 or 750?
I've already told you so: the 750W may be a better option, but even the 650W should work flawlessly. They are less good PSUs than the Kingwin, but more probably that not, they're not less quiet.
Okay, I misunderstood you in the last thread. If the Kingwin 550 is better than the BeQuiet 550, then I might as well forget the BeQuiet because from what I've seen it's always more expensive and is less likely to go on sale.
Just a note: some days ago EVGA released two new PSUs, the SuperNOVA G2 750W and 850W: the relevant OEM is Super Flower, the platform upon it's based is the Leadex Gold, which is slightly better than the original Golden King used on the Kingwin unit.
I think the 750W unit (SKU: 220-G2-0750-XR) should go for about 120 USD or less, so it may worth more than a look.
Thanks for the suggestion, but looking newegg, pcpartspicker, local stores and amazon I was unable to find the G2 for less than $200 except at Amazon where it goes for $130 but there's a 3-5 week wait. Just as before I haven't been able to find anyone selling super flower. When I mentioned this before you suggested the Kingwin.
As said, there are lots of alternatives if you can't find it at a convenient price.
Well, if you have any more, let me know. It seems to me it's either the Kingwin or the Corsair. You dissuaded me from the Seasonics and the other options are either too expensive or not readily available to me here in the US. You don't seem very fond of the S12 but it got good reviews in its day and I've found its noise level to be tolerable. I probably have a greater tolerance for noise.
Thanks for your advice (again) Luca.