Hi Mark,
An obvious recommendation for your system would be to go with a BAT solid state preamp. The VK20 would be a little less than $1500 used and the VK40 would be in the 2-2.5 range depending on options such as batpack and remote. If you would venture toward tubes I would recommend a BAT VK5 which you should be able to find in $1500 used range. A great match with your amp and your speakers.
Good luck in your search.
An obvious recommendation for your system would be to go with a BAT solid state preamp. The VK20 would be a little less than $1500 used and the VK40 would be in the 2-2.5 range depending on options such as batpack and remote. If you would venture toward tubes I would recommend a BAT VK5 which you should be able to find in $1500 used range. A great match with your amp and your speakers.
Good luck in your search.