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Spokes and nipples I just guessed at from the Pillar website. But no prices so I don't know if I was looking at something too expensive.
Again, I wouldnt worry about weight too much. Do you have a valid reason to use 28h over 32h?
Purely that those Pacenti rims are super cheap on PlanetX at the moment. I'm thinking CL25 instead of TL28 though; 25g lighter each and a more suitable rim width for what I want, only £5 more.
frankenbike-
Spoke weight is generally quoted at the shortest length they offer, for obvious reasons. Personally I'd just go for 32h but if they're built right 28H could/should be fine for 80kg.
ACI Alpina are currently the cheapest double butted you can order in the UK. You won't see much of an improvement spending more on fancier spokes than those.
With regards to wheel building, get a decent tension meter and do a lot of research before building. No reason you couldnt build a bombproof pair of wheels on little experience. The key is just taking your time and continually adjusting until all the tensions are even, the wheel is true and round. This might take up a whole afternoon per wheel so paying someone like Arup ~£20ish per wheel to do this for you could be economical. Having verniers to measure up the hubs and rims is also crucial
Turkish
You can get those hubs for a bit cheaper, ~£135 i think. Spokes and nipples wont be that light unless youre using cx rays. I used those hubs, 420g rims and ACI Alpina (double butted) spokes and it came to just under 1700g all in.
Again, I wouldnt worry about weight too much. Do you have a valid reason to use 28h over 32h?