I am not against overbuying on a quality PSU, well I am to a point, but linking some benchmark showing some extreme wattage usage does not help a beginner in any way and that was the main point to my rebuttal. Also, I think if you are getting into mining you do need to also learn how to tweak and optimize your rigs. Just throwing an overpriced excessive wattage PSU at non-optimized settings may have worked in April, May, June, July, and perhaps August for ROI purposes, but going forward people getting into the game are going to need to learn to optimize, optimize, optimize.

As far as the ROI question, I am with you 100% but I am tired of pointing out the obvious to people who only want to know how to get into mining. So I stopped pointing that fact out and now just offer advice on how to build rigs. But this again empathizes my goal of not overspending where you do not need to. Spending an extra $50-$75 on a oversized PSU will only lengthen that period.

So I recommend to the OP once he buys his gear, which I stand behind in my listing above, that he also comes back and asks about how to tweak it for optimal performance. There is also no harm in buying the base components that will support a a 5-6 GPU rig and only starting with 3-4 GPUs to learn these intricacies. Once you have this down you can always upgrade your rig to its maximum potential. This way you will have the best of both worlds, a reasonably priced and sized rig and you wont burn your house down in the interim period of learning how it all goes together and works.