Best sounding phono preamp under $600

I am presently using a Jolida JD-9 with a Pro-ject RM-5 turntable and Ortofon X5-MC cartridge and am looking for opinions on solid state phono preamps that cost $600 or less. The rest of the system consists of the Qinpu integrated amp and Buggtussel Somu floorstanding speakers. Would appreciate any advice on the subject. Thanks, Bob