1x30 sander with a fresh 40 grit klingspor blue zirconia grinding belt. that chews knives down like no tomorrow...and puts fresh grinds on all manner of bar stock.
normally i start off with an 80 grit if a knife is really bad-chips, badly aligned edge, etc.
if the edge isn't too bad but needs lining up and evening out i will start with a 120 grit belt.
but in terms of stones/hand sharpening-i have some 50 grit sand cloth that would work well for major removal of stock. i also have a basic two sided stone that takes off a fair amount of metal pretty fast.