The NAD C542 is a wonderful fast, punchy, detailed CD player. I am using my 542 with a 2004 NAD T773 AVR and surprisingly, it sounds very nice. Maybe look for a used NAD C355BEE integrated. If you want a bit more "neutral", check out a used Cambridge Audio 640Av2.
I also think the Yamaha and Onkyo you mentioned should work out well.
As far as Acurus, I have owned just about every one of the Mondial designs amplifiers and currently own an A200 and A200x3. Love the sound and build quality. About as neutral as you can get. Though I have never owned any of the Acurus integrated amps(DIA-100, DIA-150), I have read nothing but great things about them.