Ok made it through the TL;DR
There are some flaws in your scenario. You included your automobile and home into your expenses, no in fact you included your actual expenses, which is a mistake. Ok first lets take the home and auto back out, you dont pay federal taxes on those anyway, maybe ad valorem locally, but you cant count that. Ok so lets say 300 for the car and 650 home or rent. Thats 950 out of the 2k which leaves 1050. Ok so now everything else we'll assume taxable expenses. So now comes the 23% tax on the 1050 you will be spending on living expenses, groceries, grooming, entertainment, etc. First of all, under the FairTax you still only spent 1050, because the tax is inclusive, not exclusive, so you tax component of the 1050 was 241.50. Times 12 means you paid 2898 that year total in FairTax. Thank you FairTax for the 2000 prebate that means you only paid 898 in taxes. Seems you are still living a bit above the poverty level young man. So, 898 total FairTax, which is what is now funding the federal government, means out of 35000 you only spent 898 of your own money (dont count the prebate as income, it was to wash off your tax liability, and went right back out the door) which means you get to keep roughly 97.5% of your income, other expenditures notwithstanding, like retirment, healthcare, state and local taxes, and etc.
So same figures for me (btw thanks for the modest income, I shall use it wisely

) so my FairTax component is still only 898, same as you. Thats 99.5% of my income. I got news for you though. If I make 350k a year, I'm not living on 2k a month. Sure get wealth envy if you like and b*tch about my 99.5%, but dont piss on the 97.5% you got to keep.
On to capital gains. Yes they go away. Yes the FairTax will adequately replace them. I must admit however, that I'm currently not as well spoken on that aspect of the plan, and why it will work. That shall be my next assignment on the issue, and perhaps I can enlighten you then.
I dont want to say that you intentionally misrepresented things, and so I wont. Only that I had to correct some of the details of your scenario. One of the things that irritates me to no end with FairTax neigh sayers, is that they love to misrepresent the facts. One good example, and again I'm not advocating that you intentionally did this, but
IBCoupe wrote:
(because of the 30% sales tax imposed by the FairTax)
What you've done here is to consider the FairTax to be exclusive, but still enjoyed the benefit of considering the Income tax inclusive. It doesnt work that way. Lets keep it apples to apples. Ill explain. Lets take a 100 VCR (who buys those anymore right?) Ok so
1) Inclusive tax - means that the tax component is included in the price on the shelf. $100, tax is $23. Last time I checked 23 was 23% of 100 right?
2) Exclusive tax - the way sales tax currently works and the way opponents like to view the FairTax, comes in after the price on the shelf. So figuring above, the toaster cost is $77, then $23 on top of that for taxes. Now is where things get ugly because $23 is 30% of $77.
Why does this difference matter you ask? Lets consider how we calculated our income tax before. Using your example only (dont need both).
1) Inclusive tax - this is how you like to view the income tax, so you made $35k for the year, and your tax was $5303. Thats roughly 15% of your total income.
2) Exclusive tax - means you would pay the tax externally after your income. Well you cant pay more than you made, so for calculation we'll reduce your annual gross by the tax amount and call that figure your actual income. So 35k take away 5303 leaves 29697. So now 5303 is a whopping 17.5%.
Now, I realize looking at Income tax exlusively is sortof mind twisting, and not really how we'd want to look at it. But for honest arguments sake, lets also commit to considering the FairTax, or any other plan, on the same grounds as the income tax. Either look at both inclusively, or exclusively, your choice, but lets keep it real. And just so you know, the FairTax is proposed as an inclusive tax anyway. Makes things much easier for the general public. The goal then would also be to get any state sales taxes to also switch to an inclusive method, thereby making purchasing alot easier, as there would be no more "ok so how much will that be with tax...." discussions at the checkout.
EDIT - Yes I excluded both of our actual living expenses. First of all, the prebate is not designed to pay your expenses, only to preimburse you for the tax component of those expenses. You cant figure expenses in these scenarios, they are out of the control of the government, they are extremely volatile details that could change at anytime. Additionally, you've gotten comfortable allowing your living expenses to be an additional 80% of your income. Thats not fiscally healthy, improve yourself son. But thats not the government's bag to carry.