D.I.D. o-ring chain, sidewinder sprockets, and the TM Designworks case saver. The largest sprocket that will fit with the TM designworks case saver is 15 tooth. Try to work your gearing around a 15 tooth front, for the case saver will work the best if the chain cannot bind up between the case saver and the sprocket.
Maybe a large rear sprocket will cause clearance issues with a skid plate, but larger sprockets, front and rear, will greatly increase the life of the chain and sprockets...