Out of the boards listed I would go with the Proto to be able to do everything. That said it does have a bit more of a freestyle influence. The NS Cobra is is basically the all mountain Proto. Since you aren't really hitting too many park features this may be a better choice.
If you haven't yet I would tell you to take a look at boards with flat camber or positive camber all the way from past insert to past insert before hitting some rocker. An example of this would be the Salomon Man's Board. This is a board I would tell you to seriously consider.
The Rome Bosses are ok bindings. Not necessarily what I would go for but at $118 they will do the job.