Budget preamp recommendation...besides Schiit.

You already have more options that you can sift through, but let me add a vote for the Rogue RP1. With used examples under $1k, it's a truly fantastic preamp for the money. 

And if your budget would be happier at half of that amount, find a used Freya S. Highly transparent, choice of gain including passive, fully balanced if that's important. Can't imagine getting more for your money. 

If you can find one, McCormick TLC-1

Schiit Kara?? 😉

One thing forsure , never buy a preamp with a cheap round silver Alps volume pot 

or bournes, a stepped ladder resistor type or relay , if you are using a remote 

if not at least a resistive ladder type to get the most out of your audio system.

So many variables need to be known. What connections and what type? Balanced? etc.

For a very inexpensive option, and if older is okay, a NAD 106 came through here this week and I tell you what, pretty darn good and it has balanced out even.  Really good if you have just one line in for all digital source from a DAC or similar..

There is a really good recap upgrade thread for it on AK too.