Flat tax is the only way to go as it is incremental enough to actually make it.
We started with a flat tax, incremental is all it is about. Incremental dickering with the code right back to where we are.
"A hand from Washington will be stretched out and placed upon every man's business; the eye of the federal inspector will be in every man's counting house....The law will of necessity have inquisical features, it will provide penalties, it will create complicated machinery. Under it men will be hauled into courts distant from their homes. Heavy fines imposed by distant and unfamiliar tribunals will constantly menace the tax payer. An army of federal inspectors, spies, and detectives will descend upon the state."
-- Virginian House Speaker Richard E. Byrd, 1910, predicting the consequences of an income tax.
The problem with a Flat Tax, is it is still an income tax, IRS into everyone's business from stem to stern. You may want to take a look at:
Flat Tax as Seen by a Tax Preparer
by Vern Hoven
It isn't the rate structure or size of the form you fill out that makes an income tax system a nightmare, it Congress' continual dinkering and redefining income to suit the politcal whims all the time and the bureaucracy behind it that is there to make sure what you put on that form is accurate in the IRS's eyes.
Source: CCH Inc. Number of pages in the CCH Standard Federal Tax Reporter, as found on Cato website.
The NRST will allow every voter (for the first time) an opportunity to actually see what their government costs them on every receipt. It is only out of knowledge, that one can expect an electorate to exercise it's most important function, that "Eternal Vigilence" that is so necessary to preserving liberty.