Will - If it's got a Vox Humana, it's an American Organ - wherever it was made. (As in French horns which have been made in China) Vox Humana isn't a sound of its own though, it's a sort of shimmering effect brought about by the air-blown rotation of a thing on a long spindle that I can't quite describe. The VH stop won't make a sound on its own.

Don - You won't go far wrong with Roland or Yamaha, not much to choose between them price or quality-wise. The Roland tone tends to be fuller/richer than Yamaha, who score when it comes to brightness/top-end. They both do a full range from minimal looking studio keyboards up to front-parlour instruments that are more like furniture.