I don't really have one party that I completely identify with. I often vote based on the major issues and the platforms of the candidates. I also have an eye towards a balance of power. If a Republican is President, I'm more likely to vote for a Democrat Congressman, and visa versa. When gay rights were a major issue in Congress, I leaned Democrat. When gun rights were a major issue, I leaned Republican.
In general, I am heavily Libertarian, being a fan of individual liberty and limited government. However, my idea of limited government is a bit different than most Libertarians so I can't get behind it 100%. I want the government to stop trying to run our lives, but I don't think taxes are theft, I still think the government should be providing basic services like roads, I'm not opposed to welfare programs (sometimes I take issue with the particular implementation but not the idea in general), and I don't think that an unregulated market will remain a free one.
If I had it my way, we would go back to taxes being apportioned among the states rather than the income tax, Senators would still be chosen by the states, and the House would be more like a Parliament style where people can vote for whatever party they want, and your vote will count even if you are a Republican in a heavily Democratic district. I think those changes would make the government more budget-conscious, help reign in the federal government (which I think is largely overstepping its Constitutional boundaries), and would let third parties into the mix (which would also have the effect of reducing the chance that one of the two major parties dominates the government at any given time).