.TV or .Mobi or .US or .IN ??? Plural or not??

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I am new to this, and was wondering if someone could help me understand how to choose a TLD/ccTLD. Also if plurals work better or not?

Sometimes I get really confused on which one to buy and would have potential.

I am going to illustrate two examples that would help you guys understand my dilemma and help arrive at a conclusion.

Example One:
A generic name like 'blankblueraydisc' is available in .tv, .info, .mobi, .us and .in.

I can safely assume that .info, .us and .in are the better extensions?

My reason: .mobi is perhaps a mobile led tld and maynot have too much excitement with regards to blueraydisc. However a retailer, manufacturer would be keen to get the .US or .IN domain. Similarly .info can be used to create a information site on blankblueraydisc.

Similarly, whether disc or discs

Example Two:
A city or something like a celebrity name is available, which domain would I choose? Celebrity is country specific usually... but how about just the keyword "celebrity"?

Again should I go with celebrities or celebrity?

and SCORE or SCORES?

Please throw some light..

Cheers
B