Don't know the best, but I use a Musical Fidelity Nu-Vista 300. Silky smooth highs and solid bass. The mids are true to life with a coolish/dryish presentation. Plenty of power for sure. Typical preamp gain is 9 to 11 O'clock position. Rock'n out ear splitting Rolling Stones is 12 to 1 O'Clock with complete composure.
