To the O.P.
You say 'road' but is that sport-casual, or more race geometry???
How 'high end' or lightweight do you want to go?
As a case in point, my relatively low-end '84 Univega 57cm/23" Viva Sport (double-butted CrMo frame, Mangalite fork) started out at 25 pounds but is now under 23 pounds with careful component choice (1st gen Cyclone derailleurs, VO road pedals, Araya Model 20 27x1" wheels, lighter seatpost and saddle, and lightweight 27x1-1/8 tires and latex tubes.) That is getting down to Pro Miyata territory -- their lightest bike with clinchers in '84!
My 'touring' Univega is the same frame size and f/f materials, but weighs about three pounds more, bare.
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'75 Fuji S-10S bought new, 52k+ miles and still going!
'84 Univega Gran Tourismo
'84 Univega Viva Sport
'86 Miyata 710
'90 Schwinn Woodlands
Unknown brand MTB of questionable lineage aka 'Mutt Trail Bike'
Plus or minus a few others from time-to-time