Upgrading preamp. Best for under $1K

Thanks for the responses! It seems tubes is the way to go for preamp but will it match well with the B&K amp?

Again thanks for all the recommendations.

@soix i had the RC-980BX preamp and to my current RC-995, there was a huge difference in sound quality, especially in the bass region. It has a much better, tighter bass with better definition. The mid and highs also improved. I really want an upgrade where the sound in the upper region to be more dynamic and realistic without losing bass detail and definition. As far as impedance mismatch between pre and amp in my system, i am pretty close to ideal.

Thank you all for all the recommendations. I am intrigued that their are quite a few within my budget that have tube preamplifier. Honestly I really like the tube sound but for the type of music I listen to might not work well and that is mostly rock to latin. I also listen to some vocals but where I want to get is a balance and tone of the overall sound. I really like the to have a tight, articulate, well define bass which is one of my priority I think the Rotel has this region right. What lack with the Rotel is the anything in the upper midrange and high end as far as dynamics.