Based on your post, I believe just about any of the amps on your list would qualify to some degree. I have not heard the Belles, but the latest iteration of the 350 reference is getting glowing reviews. I own the Moscode 401HR, and have written about it extensively. It's extremely musical, and it's tonality can be changed with some easy tube rolling. It has no grain or sibilance, and simply sounds natural. I have heard an earlier iteration of the NuForce amps. Of all the amps on your list, the Ref9.02SE will likely have the last word in inner detail and resolution, but I find the sound too sterile for my taste. The Mac amps are known for their musicality and "non-audiophile" sound, and they would also be an excellent choice...as would the Parasound.
Tubes in an amplifier can bring the midrange forward and give some emphasis to vocals, etc.
My advice is to take your time and listen to as many of these as possible either through in-home auditions with money back guarantees (Moscode and NuForce), or through dealer arranged auditions.
Start with the amps you can hear and return without obligation (other than shipping charges). Eventually, one or two amplifiers will likely strike you as "right", and then it will become difficult to choose which one to buy because no amplifier is perfect, and you'll notice pluses and minuses with each.