My biased vote would be the Yamaha A-S1000, which can be bought pretty much anywhere new for $1,260 currently. I purchased this amp after researching it, the Marantz units and the NAD 375 BEE. Also, prior to the purchase I was looking at, and in fact won the auction on, a renovated Sansui 9090DB vintage receiver, but the seller was unable to deliver and the deal was cancelled. I had bought one of these new in 1976 and truly loved it and its sound, and so the current purchase was somewhat out of sentiment.
Back to the Yamaha: I've had mine a little over a month, and the sound is spectacular simply because it is pure; it adds nothing nor subtracts anything (unless you decide to use the tone controls) from the input. And as already stated, it is very, very quite. The audiophile quality of the unit is very obvious from a list of the components and its flawless cosmetics. Frankly, the Marantz units are underpowered for the price, and the NAD 375 BEE, for the price, is rather cosmetically cheap looking. The NAD does however have quite a bit of power, but at the same time the sound is somewhat colored (warm; i.e., distorted).
Lastly, if you can afford the A-S1000's replacement (I couldn't justify it at this time), go for the A-S1100.