I really like the McIntosh C2300 or C2500 depending on your needs..If your willing to drop some bells and whistles, a Modwright SWL 9.0 used or a new LS100. Also, I really like the Manley Jumbo Shrimp or the Manley labs 300B! What amazing sound! partnered with a great solid state amp like you have would be a great match, keep an eye on impedance matching ..it does matter. the output of the pre should be 10 times or even greater apart than the amps input impedance. Example... 200ohm output from a pre into a 20,000ohm or HIGHER amp input is best to look for.