New DAC recommendation $1K, hopefully tube.

I currently use a Benchmark DAC1 and really like it. With a new iMac on the way, the DAC1 will be used for headphone duty only on my desk.

So now I need a new DAC for the Krell/Focal system. I'm open to any suggestions following these guidlines:

1. Prefer tube as I'd like to see what they offer.
2. Less than $1K.
3. Prefer balanced outputs, but not necessary.
4. Multiple digital inputs.
5. Excellent jitter reduction for Airport Express.

Thank you,
gherrera1