FairTax is the only way to go. There is no negative about it for a free nation of free people who believe in limited government, individual liberty, and right to keep the government out of your life and out of your wallet until you're ready to hand them some money when you voluntarily decide to purchase new goods and services.
And here is the source for the most comprehensive research on the topic of the FairTax, HR 25 in the US House of Representatives with 67 Sponsors and S 155 in the US Senate with 6 Sponsors and more who will be now that the government's website is showing the current new bill for the 2015 session. I see that Ted Cruz just signed on this month who was a sponsor last session, and Richard Burr will be also, since he's a long-standing supporter of the FairTax and was a sponsor last session as well.
www.fairtax.org
If you go to the research section, it posts all research with comments pointing out errors in the research that has a negative conclusion. One of the biggest errors was in the study done by the Committee appointed by Bush II, who liked the FairTax, and appointed a committee with funding to research it. Despite their big budget and over a year spent on it, they failed to incorporate the crucial fact that the FairTax rate of 23% includes 8.09% earmarked to fund Social Security and Medicare, with the balance of 14.91% funding general revenue! How could an honest research team make suck a grotesque error? Because all the people who "research" against the FairTax are employed by the tax industry, that's how they make their living and they're worried they might have to take their billions and invest in something new, something competitive, something real, and something that actually makes a production or actual service contribution to the United States that people actually want to buy.
The only people against the FairTax are people who work in the income tax business, want to "tax the rich" to redistribute from those who earned it to those who didn't, or are people who have read the income tax lobby "internet" postings and rants against it and haven't bothered to check the facts.
There's even a report at the FairTax website on the Fact Check.org "fact check" on the FairTax, who also blew their fact check mission, misstated and misrepresented the FairTax, were caught and called on the carpet about it, and eventually but reluctantly posted the correction. FactCheck.org is like the Ford Foundation, and is no longer what the founders of the funds expected it to be or do.
One of the groups the Anti-FairTax lobby has tried very hard to get some footing in their opposition are Senior Citizens, convincing a few that if the FairTax passes, they'll be subject to double-tax on their savings and retirement plans which couldn't be further from the truth. There is no income tax at all on their retirement funds when they draw them out under the FairTax because the income tax is repealed. They are eligible for the Rebate if they want it which exempts FairTax on their purchases up to the Household Consumption Allowance whether they spend it or not, and the FairTax they do choose to pay is the same as the embedded income taxes they would have paid under the income tax plus under the income tax, they would pay income tax on their retirements when they draw them out.