Not familiar with Ayon or Sunrise (Chinese perhaps?) but I am familiar with DK and I know of the reputation that VAC gear has. I honestly have never seen anything negative written about any VAC integrated (from the press or consumers) and that's rare in this industry. Sonically they have a stellar reputation in the audiophile world. You pay for that performance however, they are rather expensive. Since you say cost is not an object, out of those 4 choices my opinion is go with one of VAC's intergrateds. DK makes some very high value high performance hybrid intergrateds but VAC tube integrateds are in another league. You asked for an opinion, this is mine.
