AUS-8 steel is pretty straightforward stuff (new versions are apparently 8Cr14MoV; but same advice applies). Anything in SiC (silicon carbide) or AlOx (aluminum oxide) would handle it with ease. Norton's Crystolon (SiC) and India (AlOx) stones would be an easy pick, if I were in your shoes. Wet/dry sandpaper would also handle it, in a pinch. Most is SiC, some is AlOx.
David