Both GL29/31: Rusty Auburn and GL30/32: Dark Copper are great options.
Gabor's GL27/29: Chocolate Caramel & GL8/29: Hazelnut are a little more like Jon Renau's FS26/31: Caramel Syrup, but much more blended. This shade is more of a blonde and light copper blend, so it's going fall more on the light auburn brown side of the spectrum.
We have some amazing color spotlights on all these shades. All of the links are included below:
GL29/31: Rusty Auburn - HERE
GL30/32: Dark Copper - HERE
GL27/29: Chocolate Caramel - HERE
GL8/29: Hazelnut - HERE