I am looking for a preamp to pair with Nuprime ST-10 poweramp driving PSB Image B25 bookshelf speakers. Source is a NAD CD player, so I don't necessarily need a DAC built into preamp. I listen to rock, prog, metal, female vocals, instrumental, regional music. I have come across general talk on various forums that pairing tube preamps with a Class D poweramp like Nuprime should work well. What do you guys suggest?