I would also try to find another domain. But if you don't want to do that, I would rank these as follows:
.ws - In general people know this one
.in - If related to India, the best choice
.tv - If related to TV, my next choice
.to - In the US, we mostly only see this used by spammers... sorry!
1. How about .US domain vs .IN domain ? I tried also to register a .US domain at godaddy and since I'm not a .US citizen godaddy doesn't allow me to do it. As EU citizen can I register and resell a .US domain outside USA, or do I get in trouble?
2. How do you define a good domain hack ? Is the following a good example:
hotne.ws
I mean how many people will remember and type a domain name like this one?
3. I know that appraisal websites like estibot are not so reliable but anyway I got an appraisal for the .IN domain extension higher than .US extension, how is this possible?