Not a WR lens, but it's a shot from the DA* 16-50 in the rain. I can vouch for the sealing in DA* zoom lenses, I've taken both of them through rough weather and I've not mollycoddled them and they're absolutely fine. Also, you might not see that many shots in the rain because it's difficult to shoot without getting droplets on the front element, as seen above.
If I were you I'd buy a DA* zoom and skip the other lenses if you want to settle on something. Probably not what you wanted to hear.
Other than that you'll probably be fine with the 50-200, it's a good lens and the WR of the kit lenses is still very good in my experience.
I would implore you to go for the DA* 50-135 though, it's an absolute gem of a lens. I've veered myself away from an 85/1.4, 77/1.8, 90/2.8, 100/2.8 and various others simply because the 50-135 is just too good for it to be worth shelling out for an entirely different lens that will only be better in one specific respect.
Another one from the 50-135 this time in salty sea wind off the scottish coast: