Again let me have the money I earn and le t me decide how it is to be spent, that is the true self-directed income tax, and that is why I vote Libertarian. Smaller amounts should be paid to other countries as incentives. We have need for the incentives right here at home. Debt service isn't optional. Defense spending would continue at about the same ratg, but would be over half the budget.
Congressional salaries remain an insignificant percentage under any system.
We already have people voting for candidates about whom they know very little other than their looks and their two or three campaign planks, if that. And that would be unconstitutional and illegal, since it discriminates. You should also note that some kinds of spending are not optional, either for legal or economic reasons. For example, one can't simply lower the amount one chooses to spend on interest on the debt. That amount is fixed by the percentage of interest the government must pay on all outstanding federal securities.