Try both the 35 and the 30. You may decide you don't like the sag of the 35.
Pattern wise, it depends on whether you love to display the Monogram or would rather be more "under the radar" about carrying LV, as much as the weatherproof issue. Mono is obviously classic and prominently LV, which may be what you're after. Damier is great because it's not quite as known to non-LV people--but that may or may not matter.
Good luck. Both are great! I started with a Mono, then got Damier. I love Damier more, myself.
Pattern wise, it depends on whether you love to display the Monogram or would rather be more "under the radar" about carrying LV, as much as the weatherproof issue. Mono is obviously classic and prominently LV, which may be what you're after. Damier is great because it's not quite as known to non-LV people--but that may or may not matter.
Good luck. Both are great! I started with a Mono, then got Damier. I love Damier more, myself.