The strengths of the Black Mamba have been discussed here many times, and it makes sense for higher end systems, cost is very high at $700 new/450 used, but performance is outstanding. To further complicate the matter Shunyata Hydra is available for less than the cost of 3 Black Mambas. I have often wondered how a Hydra/4 Sidewinders would compare to 4 Black Mambas with no Hydra.
I own four Sidewinders currently, if I were budgeting more money for power cords I think I would try a Hydra first before spending big bucks on indvidual higher end snakes.
Seems like a more "complete" solution to power upgrades.