Well, after more reading, thinking and photo oogling, I think I've decided to change my whole plan. :-/
Instead of getting the DA* 16-50 and 55, I'm pretty sure I've decided on getting the 15mm ltd and 31mm ltd. Then, with those two primes, I'd bring my 50-135 and
maybe my 50mm f1.7. I'll probably still pick up the DA* 16-50, but won't use it unless it looks like bad weather is on the way or I'm feeling lazy.
My sister dropped by yesterday having asked me to take some "creative" portraits of her and it occurred to me that I was having more fun with my 35mm f2.4 than the other lenses. The primes made me work and think more for the photos, but it was more enjoyable. Then I realized I'd have a lot more fun with the 15 + 31 ltds than the 16-50 while I'm out traveling the world.
At some point I'm sure I'll look at getting a few primes for the longer focal lengths, but I'm really attached to the 50-135 right now. I've been using it long/often enough that it feels like a third eye for me, lol.
Thanks for the recommendations everyone! I'll post some photos after/during my trip.