Ever consider a Pass preamp? Whatever you choose, make sure the impedences match up because Pass amps typically are harder on the preamp to drive relative to other amplifiers.
I use an Atma-Sphere MP-1 with Pass Labs XA-60.5 with excellent results.
I believe in general, you want to consider preamps with less than 200 omhs output impedance to match with Pass Labs if you're going to run single ended, and 600 ohms or less if you're going to run balanced.
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