IMO, The less Google knows about your business the better.

Try this:
http://piwik.org/

The great thing about it is it gives you all the Google data and it also only requires that you install it on a single domain, and you can track all your domains from that one install. You just need to add a little snip of code to each page you want to track.

However, since you do add the same snippet of code to each page across many domains, you are adding a footprint that all domains are owned by the same person. If you're not doing any cross-linking, this may or may not matter. If it does matter, you can install piwik on each domain.