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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.
Cool, I'm absolutely not bothered by 30g extra weight on the spokes, so I'll go for 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
I have some calipers so that should be fine. I built my last wheel without a tension meter - got it true and round eventually but it took a bloody long time... I took it into the shop afterwards just to have it checked over and the guy said I'd done a great job. So I'd probably just wing it on the tension again and just ping them to check the pitch is approximately even. Then take them to the shop for a check over if they don't seem to be staying true or something.
Like I said I do already have a set of wheels that do the job - they're just overbuilt for 99% of my riding - so I can ride them in the meantime and spend an age on the build process.
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