So you have one child who wants to be homeschooled and the other who doesn't? Sounds familiar. If the brick-and-mortar school is what works for one child, and homeschool is where the other wants to be, what's stopping you from doing both? That's what we do, and while the logistics get a little involved at times, we're having a brilliant year.
My son (first grade) is in a bilingual gifted magnet program at a local school. He LOVES it, and so far is doing extremely well, so I've left him where he is. He wants to be in a classroom setting, and for for now it's working well.
My daughter (4th grade) is at home with me. We are part of the Utah Virtual Academy, which supplies us with the k12 online curriculum for free. (Is this the same set-up you're considering in Colorado? If so, PM me and I can tell you a lot more about the nuts and bolts of working with the K12 curriculum.) Last year in a brick-and-mortar school was a nightmare for her. She was so far ahead in her language skills that she was bored with the language arts and literature they did. And she started and ended the year in math (which she struggles with) in pretty much the same place. My decision to pull her out was made much easier when, in response to our concerns about her problems in math, her teacher told my husband, "Well, after all, she is a girl..."
This year she is successful and happy. We will finish the year at grade level in math, way ahead of what the local schools teach in science, literature and history, and with my daughter's self-confidence restored. I've given her the choice about going back to a brick-and-mortar school. To quote her - "Why would I want to do that?" She bowled me over a few months ago when she announced that she had decided she likes math now. It's not that it is easy for her - it's that she isn't frustrated any more. Bringing her home was the best choice for this child, and for her, the K12 curriculum is a good fit.
Hope this is of some use.