Which used preamp for Halo A21, under $1,000?

The YS audio gear looks interesting, but I'd be more comfortable buying from an established brand (even if it's also made in China). Any other balanced tube preamps in this price range, used or new?

There are plenty of balanced tube preamps, but do you actually need one? Tubes have larger distortions noise and higher output impedance. Balanced solid state preamplification is prefered IMHO.

I don't necessarily need a balanced tube pre, but I'd like to consider all of my options.

New possibility: Has anyone heard the Coda CLX pre? From what I gather, it's a Window IV with upgraded parts.

The CLX is a Coda CL with upgraded parts. The CL is a slight improvement over the Windows Continuum 4. I own a CL, it is the highest value pre that I have sat in front of. This is a bold Statement, but I would have no problem putting the CLX in the league of a Pass X10. Very high performance for the $$$. It really depends on your taste, but certainly worth a listen, but....How do you get a CLX for $1000?