The Chiro amps are real turds with music, I owned the C500 and hated it. Slow, horribly imaging and soundstaging, laid back, haze over the fine details, not all that smooth, either, as I recall (didn't keep this one long at all). The Parasound amps walk all over it in every regard, even the lesser powered ones. I found the B&K lifeless, simply uninvolving. Haven't heard the other 2 you mention but as an alternative would suggest a Parasound 2205 for your needs.
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