15N20 OR L-6 for the nickle contrast, and 1084 for the contrast (it etches deeper dark than other steels due to manganise content.) 0-1 is great too for performance, but a bit more expensive. The thinner you start with, the more layers you can get faster in the same size billet with fewer heats = better for grain size and carbon loss in the fire. I generally don't go thicker than 1/8 inch stock. I personally havn't had the best luck with 1095 and L-6 mix as far as heat treating, although I know others have good luck with it. You only have a second to bring 1095 below the majic point in order to get full hardness, as opposed to 1084 an 0-1 where you have 4 to 5 seconds. Good luck, and be careful, as once you start making damascus, thats all you'll think about from then on!