Here's another recommendation for the Synthesis A40 or A100. After a very lengthy amp search that involved at least half a dozen highly regarded integrated amps, my search ended when I tried the Synthesis A100 about a year ago. Not only does it have the sound you describe, but its onboard DAC is truly excellent.
Additionally, the Synthesis was considerably cheaper than a few of the amps I had in for extended auditions, and yet I much preferred it. I never feel like I am "missing" anything when I listen to my system now. It's a great amp.