You said:
"It will be interesting to see if the average person earning 600k pay 5 time more than the person earning 125k?"

If you read my post above you will find out that it will be almost impossible to find out. So allow me to repeat myself. In order to find out this information you have to find out the following:

1) How much the rich report (again I think the top 30% of income earners is a fair place to start.) This figure is easy to find.

2) How much the rich have sheltered. Don't know how you could prove this if it isn't reported anywhere. Someone's estimates are useless here and only an opinion.

3) If the rich are sheltering money what kind of shelters are they? Do they have to pay taxes on the money eventually? In other words are they just tax differed shelters or something else. Again almost impossible to show because it isn't reported anywhere.

4) If you want to show that Bush's administration has compounded this problem you then would have to show not only that the Republicans pushed the bills through enabling these shelters and that Bush signed them into law. But also all of the above.

Pretty tall order. I prefer to believe the tax analyzers from the US Treasury dept.

I also agree with you that we will never see a flat tax.