Go with a used Accuphase Integrated. Check beforehand because they don't all have them, but when they do, they are spectacular.
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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.
I agree with Badwisdom. My uncle gave me his Accuphase E-202 Integrated that was babied. I did some cleaning and tested out the headphone jack for kicks with a pair of 25 Ohm BeyerDynamic DT-48e headphones and the sound was quite pleasant. I was really surprised. Lots of the early Accuphase Integrateds can be had for way less than your budget even if you factor in restoration repair costs.
Just wanted to update this thread. I ended up getting a Luxman 550 A II. I was a bit concerned about this 20 wpc Class A amp being able to drive the M30's, but it works spectacularly based on my listening level preferences. This Luxman is fantastic. Next step is to purchase a high-end headphone. The Audeze LCD-2 are on my wish list. Thanks everyone for your input.