Thanks. I looked at your hair after I posted and I thought we had similar hair too!
Why do you want to cut it off? Is your hair really damaged from coloring? I'm asking because the bottom half of my hair is fried from highlights, color, colorfix, etc, and the top is natural virgin growth. Instead of getting a big chop the last time I got a hair cut, I got a dark brown glaze. It blended the bottom dyed part into the natural brown of my hair enough for me to not have to cut off six inches at once. I was very pleased with the results.
This is the before and after: