good match for Atma-Sphere M60

I second Rushton's suggestions.

I agree with Rushton's suggestions, and you may also want to check out the higher impedance Totem models, such as the Tabu or the Forest.

Rush,
You're the best. providing links to your suggestions. Everyone should answer like you.

You're welcome. Hope you find something you like. The amp is a great amp, and it's well worth matching it off to speakers that allow it to shine.

BTW, I agree with Sdatch's recommendation to consider the Totem's Tatu or Forest speakers, just not the rest of Totem's lineup. Remember: you asked for just a list, no theory. :-)
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As the Bank in Banksfriend, I feel like I've gotta add something here...
I like many of the suggestions already made here:
Merlins - Biased, but I think you can't beat 'em
Proacs - Easy to drive, nice woodwork, good mids, but perhaps lacking a bit of bottom
Ref 3As, nice monitors, but won't fill the big room you have
Avantgarde horns, in a really bold color; would keep the cats from climing on ;-)
IMHO, the Coincidents are bright sounding in the highs and mids. In Trelja's system with the M60s, old Fried Transmission Line speakers just killed the Coincidents. Perhaps that's just a compliment to the Frieds...
Note to all: you've got to admire the audiophile whose got new gear enroute to him and is already dreaming up his next upgrade! Adam, you are the best...
Spencer