Estibot calculates 700 USD on domain 1, I think you can get 3 figures at end user. You should try and get in touch with worlds biggest zinc producers, I think the biggest of them are located in Australia, US and India (my father was a zinc producer, so I kind of know what I'm talking about)
For nr 2 and 3 I wouldn't really know, I personally find nr 2 is better since I know some people that've actually been there. But I wouldn't say register fee, should both be at least low 3 figures.