Let me just say I lusted after the Classic 120s all through the 1990's and beyond. I bought a Classic 60 in late1988 I think it was. Moved to the V70 a few years later for the balanced inputs. I always wanted the Classic 120's but could not afford them at the time. Especially the later CL version with the balanced inputs.I still regret selling my V70 even though I now have a Ref 110.
We compared them not long after the GS150 came out. The GS150 is better than the Ref 150 but not the Ref 150se. The Ref 5se is better than the GSpre. I would go with the Ref 150se if it were me.