He'd have to go a lot older for that...the clearances and geometry were generally a lot more relaxed before the 80s. I have an old Frejus that feels darn nice and sports tourer'ish. You wouldn't want a rack on it, but the 60s and earlier 70s Cinellis are not hyper aggressive.

You should probably avoid Colnago with what you said. You'd likely prefer De Rosa.

Just saw the budget...you're in Olmo, Bottechia, made somewhere else Bianchi, Atala territory. Honestly I'd stick to what you know and like. I'd rather have a $500 Japanese bike than a $500 Italian most of the time. You could get lucky, but you'd have to know the smaller names...and even then, it's unlikely to have that relaxed sports tourer feel.