Integrated Amps with a Headphone Input

What speakers are you trying to have it also drive?

I didn't know that the M30's were easy to drive. I'm only experienced with the compact 7's - great speakers - I hear they like mid-higher powered solid state, although others have used tubes. The Portal Panache is a wonderful integrated, sometimes found used for 700-900 dollars, supposed to have a very good headphone out (uses same amplification as speakers, not an opamp), 100wpc designed by Nelson Pass. Very neutral in presentation. The Leben CS300 gets great reviews, though I don't know if it's enough power for the Harbeths.

See my comment on the Portal Panache. Also the Leben has a really good internal headphone amp. Research those two, and see if they will work with the speakers and headphones you are using. Try the Headfi forum to look at headphone compatability.