Those are all valid choices. But for the earner on the low-end of the income scale, its less likely to be a choice than a matter of what they can afford. That's where they get hit with reduced buying power under the NRST. Get back to a flat tax on income, and I'm happily on board.
The low-end will always have less buying power no matter what the plan is. In fact, under a flat tax, you will not be giving a rebate based on the poverty level, whereas under the Fair Tax bill, you will. Those that hover around the poverty level will pay virtually no taxes.
Please read:
Is it fair for rich people to get the exact same FairTax rebate from the federal government as the poorest person in America
Here is the whole Fair Tax FAQ:
Fair Tax FAQ