I've always been mystified by the claims that enermax have low voltage output - all of mine have voltage outputs on the upper limit of the recommended range (measured at the PSU output with a precision DMM, not by the low-grade motherboard sensors).
To me it seems that the culprit is more likely to be the motherboard, as this 'problem' only appears to manifest itself with specific boards.
Sparkle certainly do make some of the power supplies for PC Power and Cooling, though I don't think that they are the sole supplier.
I've been very satisfied with my enermax supplies, although I'd be interested to try some other brands - enermax is the only branded PSU that is easily obtainable in the UK.
I ought to just reiterate the point made earlier, that it really doesn't matter what supply you get as long as it is of decent quality.
I remember trying to get my (then) new Athlon 1 GHz system, with GF2 and multiple drives working - I was using a high quality 200 W supply, but was getting occasional reboots. I bought a no-name 300 W supply - the system wouldn't post, and fans would spin really slowly. I bought a 430 W enermax - occasional reboots just like before. Turned out that the RAM was faulty - swapped it out, and the system works like a champ with the 200 W supply. I since put the enermax back, because it offers better ventilation and keeps the case temps lower.