See where I say "....but theoretically any style of lugs would be okay."?
Thoses Kalavinka lugs look quite nice from what I can see, so I'll see if I can find more info on them. I have a preference for the Slant 6 because 1) Modern tubing diameters are stiffer and ride nicer 2) Sloping top tubes make the bigger sizes look less dorky 3) I like to support people involved with progress, and I think the Slant 6 has been a long time coming.