Ah yes kgt, the American components..... May I?
1. Chris King Headset- It seems like CK is being accepted by some enthusiasts of Italian cycling nowadays. No need to mention their quality, but I like the tall stack height which allows me to use less spacers. Of course there's the Campy headset, but I'm not sure about that plastic ring around the lower cup. Looks a bit outdated and seems more fitting on a true classic like the Master. Also, I don't feel like re-greasing the headset. IMO, a headset should be a 'set it and forget it' element.
2. King titanium cage- Here, I was looking for a very simple and traditional looking piece that is light in weight. The Ti handles on POP skewers should pick up the Ti cage nicely. The Elite Ciussi is okay, but too busy looking.
3. Reynolds Wheelset- As previously mentioned, the mixed rim depth wasn't my first choice, but I got a great deal and I will try to make the best of what I have. I think mixed depth wheelsets can look great from most angles except from a straight sideview. It makes the bike appear a bit unbalanced, but looks aggressive and dynamic. However, I admit that a mixed wheelset isn't necessary for a frame like this. I plan on getting some Lightweights in the not so near future.
4. Edge seatpost- I just simply love this component. IMO, it is a smartly engineered piece that connects the saddle to the frame without making a lot of noise. The negative space around the saddle and seatpost junction is especially clean.

Everything else is Italian Italian Italian, so relax and give it a chance!!!

I do not doubt the quality of these components but the aesthetics, the decals, etc in relation to this frame. I am not even sure about the saddle choise. It's italian, ok. but it does not match the frame IMO.
It's your frame of course but I would try to be more "gentle". You can make something really amazing or something... so and so by using, whatever components. Try at least to remove the decals.
PS The campy headset is of the highest quality BTW.

My view has nothing to do with the "origin" of the company. It has to do with the design concept, colors etc. The prologo is a fine italian saddle but the red bits do not match your frame. There's not even a red dot on your frame. Details you may say, but god is in the details as we know.

As you said - for Colnago and Prologo - Wilier collaborates with ritchey components since 2002-2003 if I remember well. No coincidence that the ritchey logos are too small and minimal to interfere with the big Wilier logo IMHO.