Why should I vote Republican?

A comment from The Anchoress's post about Republicans:

I am a non-Republican conservative libertarian. While I am too young to be a Reagan Republican, I have grown attracted to Reagan’s philosophy that the government doesn’t hold the solutions to our problem, the government IS our problem.
I have a simple (open) request: tell me how your Republican of choice believes in smaller government.
Mitt Romney wants to spend Federal dollars to revitalize Michigan’s economy. McCain wrote the biggest and most useless infringement on free speech since the Alien and Sedition Acts. Huckabee has a spending list longer than his arm, and wants to dip the government’s hand even deeper into health care. Even if you can get past the fact that Guiliani is a serial adulterer, he is in no way a “conservative” (the Federal government has little business in the health care industry or school choice).
The comptroller of the US currently estimates that, if the goverment worked under business accounting rules, the federal deficit wouldn’t be $9 trillion (the official number), but $58 trillion. By failing to put back cash to pay for Social Security and Medicare’s expected outflow, by 2040 the current government will be bankrupt. My children will have to spend the entire Gross National Product of the US paying for Social Security, Medicare, and Medicade.
I want a Supreme Court that includes strict constructionists. I am strictly anti-abortion. However, a strict constructionist SCOTUS doesn’t help if we’re broke. At most, we have the next 10-15 years to fix the problems, yet none of this crew has any desire to think that there is a problem. We are past the “cutting 50 million in taxes” stage. Our government is functionally bankrupt, and we need REAL fixes, not “portable health care” or small tax cuts that won’t be backed by spending cuts.
This crew of Republicans differs from the Democrats at most by degrees. Where is the real difference?