Why do we conservatives object to Obamacare?

DQ here.  Maybe all of the super smart readers of the Bookwormroom have this all figured out, but I’m having a bit of trouble understanding whether the conservative objection to Obamacare is to the whole idea of the government being involved in health care or to the proposed implementation.  Please help me out here with your comments and analysis.

It is possible to oppose Obamacare on fundamental philosophical grounds.  It is “socialized medicine,”  a government take-over of another huge chunk of our economy.  We know that with government money comes government control and government inefficiency.  We object to the loss of freedom that inevitably accompanies the growth of power in governmental hands.  But, by that logic, we’d have to oppose Medicare and Medicaid, wouldn’t we?  And those haven’t turned out so bad.  Anyway, we accept direct government employment of policemen, firemen, teachers and lawyers (district attorneys and public defenders, anyway).  What’s so bad about government employment of doctors?

On the other hand, it is possible to agree with the general idea that the government should provide some medical service, perhaps even be the insurer of last result, but oppose the implementation called Obamacare, under which the government does not just ensure that all can receive health care, but (unlike with Medicare and Medicaid) takes over the whole system. This isn’t just a provision of service, it’s a naked power grab. 

I’m not sure where I stand.  I know Obamacare in a horrid idea. And I have a deep fundamental mistrust of big government.  But I’m not sure I’d go so far as to say the government has no role to play in health care.  I don’ t think we should junk Medicare and Medicaid and I’m open to argument that we should expand them to cover all people without health insurance.  Anyway, now that the Republicans are taking power of 1/6th of the government, we’re going to have to do more than just oppose Obamacare; we need to work for a positive goal and outcome.  So I ask you, why do you oppose Obamacare and what do you think should take its place?  And, while you’re at it, how do we get there from here?