Buy a BAT. They’re truly balanced design’s, and they have many different preamps available in your price range. Research Balanced Audio Technologies. They’ve been around since the early 90’s and have an excellent reputation with fantastic customer service if you ever have a problem.
I’ve used BAT preamp’s with nary a problem and each was a joy to listen to. For up to $6k you can acquire a VK51 with the Russian Super Tubes and still save some money.