I would think you'd want a softer flex for more flexibility. The nice thing about the new urethane backed bindings is that they're designed to still give you enough control for heel/toe carving.
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