Hm, both the 10-8 sights and the Dawson options seem attractive. I think I'd like the very simple black rear and tritium front 10-8's, and I bet that the Dawsons are no slouch either. Plus Dawson has a Perfect Impact Policy, so they'll work with you to make sure you get the right height front sight to get able to shoot point of aim, point of impact at your preferred distance.
That begs two questions:
1. What is a recommended pistol zeroing distance for most combat-style shooting? I assume 25 yards is a bit silly, but is 10 yards too close? Would 15 be a respectable compromise? Please keep in mind that I shoot a lot at 5 and 7 yards as well.
2. Assuming I shoot the same ammo all the time (which is nearly true), how do I go about figuring out the right height of sights for a 5" Walther PPQ in 9mm?