Good headphone amplifier

I have owned a number of solid state amps over the years. Including a Vioelectric that I imported from Europe for its high current capability, a Schiit Mojolir and some others. But for me Woo amps sound really natural and have enough power. I ahave the WA6, WA6SE, And WA5LE. While clearly the WA5 is the best it is pretty expensive. The WA6SE has plenty of power and drives them well with a very natural and musical sound. Highly recommended.

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.