I live in an area where no store carries any of these, so before laying down a huge wad of cash, I'd like to hear what everyone thinks of these? I'd love to hear both positives and negatives about each. Strengths and weaknesses would be great too. Does anyone know where there might be audio samples of these? Also, are there any other high-quality preamps that I should be considering? I've heard that Epifani is coming out with one (probably pretty pricey though). Anybody heard it? Thanks in advance for your opinions.