Hi, I have a couple or three doubts, I hope not very difficult ones.

1 - Domains .info or .me or .biz.... which one of them is best, which is worst?
2 - Is there a free way to check if many long tail keywords have an exact domain available?
3 - How can I access google.com and be sure I am seeing the US version? I remember there's an url I can go but don't remember which
4 - Is there a website that checks the top 10 results of a search in google, and tells you pr, backlinks, etc, of the first results?

Thank you!