Get the P5B-Deluxe if you want the highest possible overclock. The board does have a 4/5 divider problem so either 1/1 or 2/3 will give good overclocks. Get the highest rated memory that you can afford. Corsair, Crucial, OCZ, etc all make great ram and everybody will have a different opinion what is best. For me I prefer GSkill and CellShock. Look for sticks produced with the Micron chips for the highest possible OC.