Pretty easy: "Get the government out of healthcare and prices will be affordable for everyone!" Throw in "patient-centered" for bonus points.
That's probably the most common argument.
Pretty much.
The modern American conservative voter is awash in a mythology that gets roundly exposed when push comes to shove with the healthcare debate. Because the healthcare problem in America tears apart the glue that holds their mythology together.
This mythology that says the government is evil, private industry is good, and less is more.
Less government means more choice, more quality, more affordability, and always greater efficiency. The private market, with the least amount of regulations and government interference, will produce the best and most equitable arrangement for citizens.
Where "best" and "equitable" are left up to be further defined by the projections and wishful thinkings of the person preaching it. Like any good mythology it allows ample room for fantasy.
The glue holding this mythology together though - that has to remain in place for the whole thing to work - is a collective ignorance to the economic concept of market failure.
Like spotlighting the problem of falsifiability to Intelligence Design proponents, the problem of market failure is the achilles heel to this particular mythology. And American healthcare exposes this better then almost anything else in American society. Because every time they try to square that round peg, they butt up against what they think should happen, with what actually happens. Which is instead of a simultaneous rise in equity, affordability, market health, and efficiency, the opposite on most fronts(if not all) tends to occur.