Not yet having heard the new OC9 line, my recommendation would be the AT33PTG/II. To my eyes the 33-line has more warmth than the (old) OC9-line, while being just as detailed and refined. Since you say you don't want to give up any warmth, the former would seem the better choice.
As far as Ortofon's Quintet series go, I would say the AT33PTG/II is at least the equal of the Black and superior to the Bronze, at lower cost than either.
As far as Ortofon's Quintet series go, I would say the AT33PTG/II is at least the equal of the Black and superior to the Bronze, at lower cost than either.