I am looking for a good Tube Preamp to match up with the equipment listed below. I will continue to use the two Spec Amps to power my DQ-10’s; I am leaning towards Audio Research or McIntosh Preamp s, used of coarse $1500 - $2000 when I bought the 10’s years ago, the guy I bought them from was using all Audio Research equipment . Any recommendations or thoughts would be welcome. I mostly listen to Blues, Jazz and 70’s Rock.