Good headphone amplifier

I use a Simaudio 430HA with my LCD-4.  Plenty of power and very detailed and transparent.  I've owned many headphone amps and the 430HA is the best so far.  My Sony TA-ZH1ES is a close second.  What's your budget?

Greg, Thank you for your recommendations. I was looking for something in 1k range used. I hope more people will respond with their experiences.

I have Audeze LCD-XC headphones. I drive them with a couple of DACs, but the one I like the best is my Benchmark DAC1. You can find newer versions of the Benchmark (DAC2, retails for $2K) pre-owned for around $1K. You'll need to look hard to find better, more transparent sound.

If you can find an Auralic Taurus Mk2 amp you would be doing well. I like the Auralic to the point that it was the only original component I kept as a spare to my Moon 430 ha amp.

Thanks for the suggestions.