OK. Rereading my post I wasn't clear either! I'm not happy with taxing both income and purchases. Either one OK.
I could be talked into Federal government taxes income, states tax sales, or vice versa.
The current system of taxing coming, going and staying put (Income, sales, and property taxes, and "fees", etc.) just has to collapse under it's own weight!
I havent studied economics of taxation enough so I am not sure what is the least disruptive way of taxing would be for the economie. The simplest system is probably the best as you said something like 10% federal income tax and 10% state based sales tax could work.
During the time of the reform the flexibility of the power that Fed now wields can be usefull. But once the taxation system is in place completely and few years passed to stabilise the situation we need to legislate the money growth rate(2-3% whatever seems resonable) and stop money market interventions. It is getting kindof stupid that people are obsessed about Greenspan so much(admitedly very smart economist)