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LoginShort answer 16 strings x 128 nodes = 61.56 amp or 738.72 watts on the 12 volt rail. You will need a ~900 watt or greater power supply to get that as the total rating includes the 3.3, 5, -5, and -12 volt power rails.
Be careful to look at the 12v output as you are evaluating power supplies. Most of the cheap (<$20) ones only have around 15 amps @ 12 volts. With the hubs expected to cost in the $50 range, it might make sense to really load one up - $50 hub + $100 power supply vs 2x$50 hubs + 2x$50 power supplies
Also, be sure to look for power supplies with a single 12 volt rail. It is never a good idea to connect the outputs of two power supplies together, the same applies to two power rails in the same supply. Depending on the design, you may be OK, but since you are not privy to that information, it is safer to just not do it. The issue is that if the two outputs are not perfectly matched (or protected), the supply with the lower voltage will work to regulate down the higher voltage supply - sure it may be only a 0.1 volt difference, but with the very low output impedance of a power supply, that can be many amps...
RM