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163cm is the largest size available in this board, so 170 is not an option.
Burton has an interactive sizing tool here, check it out: http://www.burton.com/on/demandware.store/Sites-Burton_US-Site/default/Product-SizeCharts?pid=W14-11540100
I've used these quite a bit and have not had that issue. The bindings are on a pivot hinge system, so the platform doesn't spring back into place like some snowshoes that use a tension or twist system.
The price is for a set of pedals (2 pedals).
How old is your son? Will his board size be larger next year? A good snowboard bag can last for years so it may be wise to size up if there any questions. Also, It is common for snowboarders to take multiple boards on trips and the extra space can come in handy.
That said, from personal experience, I would suggest you look at the more structured bags from Burton and Dakine. The Dakine Tour bag for example is close to the same price but offers better board protection, extra storage and a firmer more structured bag is easier to manage than a soft bag while traveling.
Yes, it fits in the shovel and probe pocket of the Float 32.
For the smaller Float packs it would have to go inside the main compartment, but you're all good with the 32.
APX for the ride down
Sorry Davin, I should have elaborated a little more. Yes, they work with other SPD SL pedals not just the DA 9k.