Would be helpful to know what aspects of sound reproduction are most important to you, what preamp you're replacing, and what you're looking to improve.
You should shoot for a minimum of a ratio of 10:1 between the input impedance of your amp and the output impedance of the preamp, and preferably higher.
Last thought -- given the price level of your components you might be under spending on the cables and interconnects. Would be a shame to possibly compromise the performance of all your $$$ electronics with cheap wires. Personally I'd go to the level of something like Acoustic Zen Satori cables and Silver Reference interconnects, used of course. Lots of other good options out there too.
All that said, there is a Pass Labs X1 preamp for sale here now that's in your price range and might be worth a look. Best of luck.
You should shoot for a minimum of a ratio of 10:1 between the input impedance of your amp and the output impedance of the preamp, and preferably higher.
Last thought -- given the price level of your components you might be under spending on the cables and interconnects. Would be a shame to possibly compromise the performance of all your $$$ electronics with cheap wires. Personally I'd go to the level of something like Acoustic Zen Satori cables and Silver Reference interconnects, used of course. Lots of other good options out there too.
All that said, there is a Pass Labs X1 preamp for sale here now that's in your price range and might be worth a look. Best of luck.