Having just read through this thread for the first time, it's interesting to see the division of attitudes on both sides of the debate.
The people in favor of universal healthcare are very pragmatic and focused on results. Universal healthcare is good because it results in decent care for a large percentage of the population at a reasonable cost.
Most of those against it are more idealistic. Universal healthcare is bad because it violates a basic principle of personal liberty: the ability to decide how to spend your own money. The fact that it may provide better care on average is irrelevant because maintaining principles is more important.
I can see merit (and flaws) in both sides of this debate. It's also interesting to see both sides talking past each other: the pro-universals asking "What do you want from your healthcare system?", not understanding that that isn't even the issue for the idealists; and the anti-universals saying "How can you justify ripping money out of my wallet?" without realizing that the pros are thinking in terms of lives saved by democratically obtained tax money. That's not a slight against the idealists, by the way -- lives are saved by defending ideals, too.
Then there's the third camp: the pragmatic anti-universals. These people claim that the inevitable price-fixing which accompanies universal healthcare stifles innovation. I've felt that way myself at times, and I think it's something we need to investigate more thoroughly.
As I get older, I think there's something to the innovation argument, but I also think it's too simplistic. Innovation depends on competition for profits, yes, but a free market isn't the only factor there; there's also overall wealth to consider. An affluent nation with price-fixing may well outperform a poorer free-market nation in the innovation department, and that opens up a whole new can of worms. It seems reasonable to me that having a healthier population may lead to a healthier economy, with fewer people missing work or being wiped out financially by crippling medical bills. Also, the 15% of the GDP that Americans spend on healthcare can't be helping the economy, either. On the other other hand, that 15% probably is stimulating innovation directly, so you can't ignore that either.
Anyway, there's one major issue here that's been touched on in this thread, but not (in my opinion) given the weight it deserves, and that's the fact that the U.S. already has an expensive and highly suboptimal universal healthcare plan in the form of emergency treatment. By law, American hospitals can't refuse emergency medical care to anyone, regardless of their ability to pay. As a result, poor people still get medical care, of a sort, except they have to wait until it develops into an emergency.
Conditions which may have cost $100 to prevent, or treat at an early stage, now require thousands of dollars of expensive (and less effective) emergency care. Since it's unlikely the hospital will see any of that money, they pass the cost on to those who can pay, which means rich patients, insurance companies, and, yes, government bailouts. The money is already being ripped from our wallets. On top of that, it wouldn't surprise me in the least to learn that this was the principal cause of the high cost of healthcare in America.
It's this last issue that's finally swung me back in favor of universal healthcare. My inner geek can't stand to see such an inefficient and broken system, which is, as others have stated, a combination of the worst aspects of both the free-market and universal systems. We can do better by just embracing the universal aspects, at least a little.