stainless butted spokes (shadow conspiracy's 3b), 1 cross for 36s, with g-sport nipples + anti-seize compound for the front;
titanium spokes, 3-cross for 48s, with g-sport nipples + anti-seize compound for the the rear;
thats my recomandation (and my setup), provided that you have already taken other measures to lighten your wheelsets - lighter rims, titanium axles, lighter hubs.