S/M will fit, as well as being a bit smaller/lighter. There's plenty of space, but as they mentioned the toeramp at full extension will still leave some overhang. Also, the straps won't be extra long, but not that big of a deal for the trade-off imo. L/XL will be easier (for a beginner) to strap in and give you more extension on the gaspedal. Being stuck in the middle too, I went for the smaller size and am very happy.
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