Tube based phono stage

The EAR 834p phonostage is quite good, particularly for the price.  The Italian company Lector Audio also makes very good tube-based phonostages, the two-box version is particularly good, but it is out of your price range unless you can find it used.

I'd consider the Allnic H-1202 at that price.  Sonics are right up the alley of a Leben/DeVore pairing.

I agree with the Allnic suggestion.....there is a new base model available. The Tron Convergence is another option that hits way above its price point but may be only available direct from Tron if you live in the USA. The Allnic is more flexible when it comes to loading values....

+1 on TRON Convergence Signature.

Heads up I'm a Tron Electric dealer (in the USA).

I’d also take a look at what Tavish has to offer. They make some fantastic phono stages. Good luck with your search.