In that budget range New I'd suggest you look at Schiit Audio Freya SS or Freya + depending on if you want tubes or not. these are getting wonderful reviews.
https://www.schiit.com/products/freya-s
https://www.schiit.com/products/freya-1
If you want to stick with Marantz I'd look at vintage, I'm not an expert in that area though but will ask a friend who owns a vintage audio shop what the best pre amp models are to look for in vintage and post tomorrow. that said 3800, 3600, 3300, 3650, 7T are well regarded.
https://www.schiit.com/products/freya-s
https://www.schiit.com/products/freya-1
If you want to stick with Marantz I'd look at vintage, I'm not an expert in that area though but will ask a friend who owns a vintage audio shop what the best pre amp models are to look for in vintage and post tomorrow. that said 3800, 3600, 3300, 3650, 7T are well regarded.