Preamp for First Watt F7

Wondering if anyone has recommendations for a preamp for the First Watt F7 power amp. Hoping to spend less than $1500, and I'm happy to buy used. My system includes Tannoy Turnberry speakers, Denafrips Pontus Dac, Firstwatt F7. This is for a second system in our bedroom, so I'm not trying to spend a ton.