umbraco Stats is a simple, integrated web statistic package. umbraco Stats knows about your website - it's integrated into the core of umbraco, uses specially logged server-side data which makes it more reliable and more easily configurable than any hosted solution.
It contains over ten bundled reports including highs and lows, referrals, country stats and much more. It comes with an api for tracking newsletters and even custom actions for automated goal tracking.
With three editions available, there's a version that'll fit your needs - even a free one.
More info and trial versions at umbracostats.umbraco.net