Bimmerlover,
I'd suggest starting with a tube preamp, you get a lot of the benefit without the complexity of a tube amp. I can highly recommend: Backert Labs Rhumba Extreme (1.3 or 1.4), and the BAT VK-80.....they were part of my listening journey when choosing a tube preamp a few months ago.
In the end I chose an Aric Audio Motherlode XL (I need XLR connections), but his Super 6SN7 linestage is also remarkable at around $4,000. My friend chose the BAT VK-80, and I was down to the Backert and the Aric Audio.....I chose the Aric Audio because it is 6SN7 based, and I really like Aric Kimball and his company