I'm not sure why you're a registered Republican based on the issues you mention. While both Democrats and Republicans seem typically interested in maintaining political power and supporting the interests of their corporate sponsors, the Republicans tend to have the worst record on the issues you're opposed to. They support the War on Drugs, the Patriot Act, and big government when it suits them.
The alternative to being treated like wards of the government is being treated like slaves of the corporations. If you're opposed to either, then we need to play them off each other instead of letting them play us off of either of them.
If you vote Republican, you're voting against your own interests. Many Republicans already do that (for instance the Tea Party patriots who vote Republican and think that Glenn Beck is some kind of grass roots patriot and not a millionaire blowhard more akin to a televangelist).
I don't like the Democrats either, but they tend to be the lesser of two evils.