Since you already like the sound of your Cary amps, you might consider one of their preamps such as the SLP-88. Alternatively, I also have tube monoblocks and the Musical Fidelity A3cr (available used for $700-800) is my favorite preamp. In my opionion, the A3cr bested some well-known tube preamps, which is why it's still in my system.
I auditioned the Rogue 66 and it provided an excellent 3D soundstage, but I found it to have a lot of noise and it wasn't very revealing of details.
Good luck!
Michael
I auditioned the Rogue 66 and it provided an excellent 3D soundstage, but I found it to have a lot of noise and it wasn't very revealing of details.
Good luck!
Michael