Just so you know, the pacenti slant 6 lugs are built around an oversize + oversize tubeset with a 1 1/8 head tube, 1 1/4 top tube and 1 3/8 down tube aka mountain os. I built my cross bike with them, and it's pretty, but also pretty beefy.

as the rumours say, darrell at lewellyn bikes in oz is coming out with a 1" headtube road os sloping lugset this year. those two are the only sloping lugsets in the universe afaik.

good luck