I have owned a Nakamichi PA7 amp. How would you

McCormack DNA-1, Odyssey Stratos would be better choices for a high powered amp. You can find either amp for your price and both can be upgraded in the future to bring them up to amazing products through SMc Audio for the McCormack and through Klaus over at Odyssey. Can't go wrong with either one.

+1 to Digepix suggestions.

I took a look at classified listings right now on A'gon and at $800 I'd look at the Aragon 4004 or the Marsh A400S. They more than match your criteria. Support for the Aragon is still available but for the Marsh no.

If you are thinking new I would say really take a look at the Emotiva XPA-2. Emotiva has a storefront on Amazon and are also having a warehouse sale so give them a call.

How would you compare the Aragon to a Bryston 3bst?

Well I finally settled on a amp. I purchased a Parasound A21 and now have to decide on a preamp or dac. I would like to connect my directv receiver and a cd player. Anyone want to chime in on my best direction? Budget is $1000. Going into Kef 104/2's

The Micromega MyDAC is a great unit and very reasonable priced at $399.