“In a truly market-based insurance exchange, women would be able to choose a health plan that met their needs and was consistent with their values, and those who wished to forgo certain benefits would have the freedom to do so. If any attempt at health reform is to succeed at reducing costs and tailoring coverage to the specific needs of each individual, it must ensure that consumers are able to choose the plan and benefits that work best for them, rather than submitting to the decisions of a bureaucratic board.”