One of those is most likley where you will end up. Maybe a 16X6. Alot depends on altitude too. You may like the W props but at your altitude your rpms may suffer a bit. So a 16X4W instead of a 17X4W is where you might wind up. ITs not an exact science and when you have gotten down to a couple of sizes as you have your decision is gonna be based on your prefrence.