Without any budget limitation, there are hundred of other amps that are definitely better than the A200 and as good as - if not better than - any being mentioned here. I have no experience w/ Adcom 5800 but I do have Acurus A200 and RL-11 driving the Magenepan 1.6 and I am quite happy w/ the setup. Of course, I would rather have the Aragon 8008xx or Bryston 4Bxx but each of them is more than twice the price of an A200. I am sure the Adcom 5800 would be the same as well. BTW, the A200 has been discontinued but you still can find them on used market for about $500. An used 8088 or 4B is at least twice that much so take your pick.
Spud.
Spud.