Too bad they designed the PSU space like that - pretty stupid, IMO. How can you fit a reduntant PSU in there, or any other oversized PSU (except maybe lengthways). I have an oversized 465W PSU that would be great for that, but it may not fit as it is about 3 7/8" high and 6 1/4" deep by the standard ATX width.
. It's a Delta workstation PSU (OEM for the HP X4000 dual Xeon) that I've modded to the standard EPS pinout. It has a max of 39 Amps on the +12 rails, active PFC and full range input tolerance (100-240V @ 50-60+Hz). Never been used in a system. I was hoping it would fit in my system, unfortunately that would require major surgery. PM me if you might be interested. Exclusivity is its own reward...
. As for regular PSUs, I almost always recommend the Sparkle FSP550-60PLG. Newegg does not have the best price on it - use Froogle, etc. to find best price. Hard to find a better PSU at any price unless you really need more power than it can supply. It has active PFC and full range input tolerance. Remember that 550 W is more than twice what most (yes, even high spec) systems actually use and Fortrons are usually conservatively rated... The Seasonic S12 series is also excellent at a higher "$perWatt of output" ratio. But they are more efficient than most so the full purchase price will eventually be repaid in power savings.
. For 'cost no object' there are only two in that category right now - Zippy and PCP&C. You will be able to add AOpen to that soon as they will have a temporary rebadge exclusive on the new Fortron 700W PSU when it comes out (looks like it's already out in U-Rope as it is in the Tom's test linked below - did very well - $200. yikes!!!). And I think I recently saw some noise about a 1 kiloWatt PSU (the Enermax Galaxy - perhaps made by Channel Well as are most other Enermax PSUs).
Linkage
.bh.
Here, have a :beer: !