Parasound A51 or Mcintosh MC205?


I have 2 Adcom's 5802 & 5503 that are connected to a Klipsch Reference II system. I'm looking to replace the Adcoms and go to a 5 channel amp. The Parasound and the Mac are on my list. I also have a B&K reference 50 that I also plan to replace with a new processor (maybe Marantz). Any thoughts on the Amps?
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The amp will go in a cabinet about 19" wide with 2 fans mounted high in the back pulling air out. Or I was looking at the Parasound fan unit that goes on top of the amp. The Adcom 5802 I have runs pretty warm also but seems to be OK in the cabinet. Still I'm torn between the two but cost is a big consideration.