thanks for all the suggestions so far.

I have both an MTB frame and a road frame lying around, so getting wheels to match the frame isn't an issue.

Originally, I was planning to use the Dyad rims. I emailed Velocity and was told that the Deep V is actually stronger, but heavier. I thought that the additional weight would be negligible compared to the benefit of added strength, so I decided to go with Deep V. If the weight really does matter that much, I will reconsider.

Availability of tubes/tires in other countries is pretty important and one of the main points in favor of 26" assuming it's true that 26" is the most common size worldwide. If 700c isn't available in most of Asia, that would be rather annoying.