Ask HN: Ethical analytics tech/company?

I am working on launching a site soon and I'd like to be able to gain a certain amount of information about my (currently-hypothetical) users. I would also like to gain this information ethically. :-)

In particular & at this point in time, I'd like to know how they got to the site, what location they are at (by country), and what browser they are using. Ideally I could also track length of time they are using the site, repeat visitors, and what "paths" they take as they move through the site.

N.b.; this is my first real public website, so I'm not 100% familiar with the players.