1. I don't buy anime based on company, rather if a company has what I want, regardless of who it is, I'll buy it for the title. But if I had to pick a company, it'd be Bandai. Of all the companies I've seen, they do the best job IMO.
2. 4kids is absolutely anime murder. I would only buy from them in desperate times, if it's a series I really want. Otherwise, I'll just catch it when it's on tv...
3. I enjoy the Japanese audio/English subs. Other than that, I don't pay much attention to the extras.
4. Nothing really.