I ordered a few tubes of gouache the other day and can't wait for them to arrive. Then I'll work on some ACEOs with a combination of those (I got acrylic gouache) and soft-body acrylics. That combination should work well for me. I can get lights over darks, and glazes of the soft-body acrylics will give me a lot of subtle color gradation.
But I do like the look of colored pencil. The graininess - which is there despite rubbing with solvent - gives an interesting texture. And I can get very nice soft edges like on the edges of this owl. I suppose I may miss that with the acrylics. We'll see!