Get your own domain. Free sites just don't work in the long run. Also no offence but it's pointless asking what niche sites are making good money on here. The whole point of niche sites is that you don't follow other people - if you do your 'niche' won't be a 'niche' for very long. Think way outside of the box. If you find a good niche keep it to yourself and don't post about it here!