Enermax dual rail 18A+18A enough ?

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I plan on getting an Enermax EG-565AX-VE 535W PSU.
It has two seperate +12V rails with 18A on +12V1 and 18A on +12V2.

After the PSU I plan on a major upgrade for the entire PC. I want to know if 18A+18A will be enough to support a fully stocked high end system for the next few years. I read somewhere that 18A is more than enough for the CPU, but the other 18A rail is barely enough for the rest of the system.
Any advice would be appreciated.

Enermax 565AX-VE Detailed Specs.