Thanks for your sugestion Phillip, but those units don't seem to be available here (and if they were they'd probably be between 25 and 65% more expensive than in the US, as most of the PSUs I'm looking at - the CM V550S being the exception).
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That makes sense, ignatz. Looking at the XFX units they seem like they may be quite noisy under load, which definitely is a concern (even though I initially may not load them much).
Comparing some more, the Cooler Master V550S does seem to stand out with both very high efficiency (and again, especially at the low levels where I'll be running it) and very quiet operation.
At this point there seem to be no reason to go with the more expensive Seasonic based units from either EVGA, Fractal or XFX.
As for the case this is going in, I'm trying to be patient for the Fractal Design Define R5 Blackout Edition (no window) to start shipping. If I can't wait, I'll go with the basic model...
edit: Another feather in the CM V550S's cap:
http://uk.hardware.info/reviews/5031/13/19-500-550w-power-supplies-group-test-conclusion
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