If you get the 164, you prob won't use it for anything but pow. Your Slayblade is pretty stiff, but the Flagship is possibly the stiffest board on the shelf this year, or at least in the very top few. I will say I'm disappointed in the quality of the topsheet though. I saw a couple in the store, brand new on the shelf, that had air bubbles in the middle (not even by the sidewalls or inserts).
16 Gnu Swallow Tail Carver . 16 NS West . 15 NS Snowtrooper BIA
16 Burton Genesis X . 15 Now Drive
16 Flow Talon . 14 Flow Hylite