The newer version of the Musical Fidelity A1 integrated has a built-in USB DAC and a phone section. It is a relatively low power class-A amp, but it was fine in my similarly sized room with several different speakers.
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I've heard the Peachtrees several times, including in high end audio demos. One such was an iPod Nano into the Peachtree, using the pre-outs to bi-amp some Maggies. Sound was fabulous and it showed off just how good both the DAC and line stage are in the Peachtree. For your purposes the bult-in power stage would be plenty as well. Plus some of the current models can dock an iPod for a direct digital feed to their built-in DAC.
Have you considered the idea of some powered speakers (e.g., AudioEngine A5) and the Benchmark DAC-1 PRE?
Several very good DACs have sufficient gain and quality of volume control, along with impedance profiles to interface with amplifiers directly, precluding the need for a preamp. If you don't need extra source connectivity, consider a good amplifier and DAC combination. The Bel Cantos you mention are a good example. They become very cost-efficient when you eliminate the pre-amp.
John, lack of a USB port generally isn't much of a problem. There are plenty of USB to S/PDIF converters out there. I use the Hagerman HagUsb (or something like that) in my office system, which uses the Mambo. I also have a Squeezebox in the office that connects via coax digital input, but the computer connects USB --> Hagerman adapter --> Toslink connection. That way I can listen to either the Squeezebox or directly from the computer, my choice.
The USB to S/PDIF adapters are inexpensive and, at least in my experience, work great. I can't tell the difference between hooking my Mac's mini-Toslink port to the Toslink input of the Mambo vs USB to Toslink. In fact, it makes a better connection as the connector is never falling out like it did with the mini-Toslink port.
DAC's with volume controls that I know of:
YBA Design WD202
Benchmark DAC1 PRE
Tact 2.2 XP (more than a DAC w/VC)
Bel Canto 3.5
Bel Canto 2.5
Peachtree Audio Nova & iNova
Peachtree Audio Decco & iDecco
Eastern Electric MiniMax DAC
Wyred 4 Sound DAC-2 and DAC-1
Burson HA-160 & 160D
Hope this helps.