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The amp choice really depends on which radio you will run as your primary.

I strongly suggest using Mega Watt power supplies. Especially the 50 amp version.

You can parallel 2, 3, 4, or more together easily and maintain good regulation and they are tough as nails. I have two of the 36 amp supplies and I have admittedly ABUSED them and they still work fine. I also have one of the 50 amp units and these are all used on my ham radio station and amp repair station.(It is closed)