Hi guys, so here's an update:
I broke a spoke of my Ksyrium, and it was really hard to find a replacement, because they are an old model. So I decided to sell them.
Bought a used set of very very light carbon wheels, bitex hubs, dtswiss sapin spokes (not sure about this... Maybe sapim spokes? Anyway, the guy who sold them to me believes the spokes are dt swiss sapin...), 25mm hubs, and they weigh around 1kg. They came with tufo tubulars.
Sold some original parts for 150€ to pay for some of my upgrades, but upgraded my allez as well:
Tiagra chainset & front derailleur
11-32 heavy roubaix (dior) cassette
old allez wheels, brakes and dropbars (upgraded the allez with the new roubaix ones)
I also got a Romin pro saddle.
So the weight is down to 6830g without pedals. This still includes a heavy tiagra rear derailleur (277g). Still thinking if I should get the Ultegra 6800 and save 90g or get sram shifters and rear derailleur and save 300g.
They come with these hubs: http://3sixty5cycling.com/bitex-raf10-rar9-road-hubs/