preamp/amp or integrated? That is the question

Hello Ladies and Gents audiophiles!
I am looking to upgrade and here are the questions:
-classic amp/preamp combo?
-integrated amp?
-vintage/classic or new?
Budget is around 4000 dollars used.
Thoughts?
I listen to: big Symphonies, electric blues, classic rock.
All answers will be read.
Thank you kindly.