TREK, Univega, Bontrager, Scott Racing series, Diamond Back Axis, pretty much everything made from Tange Ultimate Ultra/Superlight, Ritchey Logic/Prestige/WCS/ Nitanium, True Temper OX series, Reynolds 531 & up, Columbus high end suff, Dedacciai top series. Make sure the wall thickness is 0.9-0.6.-0.9. mm or 0,8.-0,5-0,.8. mm, double or triple butted tubes.
So much to choose from. Check obscure or unknown brands as well, as there are uncut gems to be had. I got a budget brand frame, made from Tange Ultimate Superlight: 1815 gr. for a 18.5" frame-top notch!
They just don't (can not) make them as they used to, goddamn it, due to safety and other regulations and let's face it, the manufacturing costs, the industrial background of making affordable fine steel frames mass-scale is changed forever, at least until the next Iron Age
.
Old fine steel is something else, make sure it fits you and will serve you well.