I'm in the middle of a long-term discussion with my pastor about this stuff. He has pretty much said that he does not feel any transgendered behaviors are sinful in and of themselves, and the line in Leviticus is lumped in with mixed fiber clothing, so It shouldn't be taken literally today.
Also, Galatians 3:28 (NIV)
There is neither Jew nor Gentile, neither slave nor free, nor is there male and female, for you are all one in Christ Jesus.