The FairTax proposals all are designed to fund at current (high) levels.
I would far rather see a flat income tax, 10% across the board (or lower).
Been there, done that and it grew back into the monster we have today. Anything that contains the words "income" and "tax" are off the table because of their obvious need for the modern equivalent of the Spanish inquisition for their administration. The government has no need to, and should not, know all that information.
Perhaps you should read Confessions of a Flat Taxer to see how one of the chief architects of the flat income tax feels about it today.