The only detail is who is going to pay. If its not the rich people, it ain't gonna be anybody.
We already pay for healthcare, in a weird way -- through your employer via deductions from your paycheck (unless you are self insured). Why should your employer have a say in what kind of health insurance you get?
We already pay more for healthcare than a single payer system would cost.
(total taxes plus healthcare) > (total taxes including single payer healthcare)
In other words you will have more disposable income.
Enjoy