It depends. Though lots of opinions here, IMHO, I would like
0) Go for
.com (if possible)
1) In most countries, it is recommended to go for ccTLDs like
.co.jp, .
co.uk,
com.cn, etc., or just use
.jp,
.uk,
.cn to make it short. This option is preferred if you are running a business in a specific country (not targetting at international market).
2) If you are aiming to expand your business to other countries, go for
.net or
.org if you like the traditional and well accepted extensions. (Personally I found very few companies/startups use .info or .biz as their main domain names.)
3) If options in 2 seem not attractive to you, pick
.co (more traditional), or
.io (technological, especially IT related). Also
.tv is a good choice if your business is related to that. At the same time, you can try .me or other internationalized ccTLDs. BTW, Google treats these ccTLDs as international TLDs: .ad, .as, .bz, .cc, .cd, .co, .dj, .fm, .io, .la, .me, .ms, .nu, .sc, .sr, .su, .tv, .tk, .ws. You may like one of them for your needs.
4) Forget to mention that, no need to take the above "rules" seriously. Just pick what you like. For example, some domain hacks are quite impressive like dnpric.es
If possible, buy all the above for protection :D