Ask HN: Best analytics tools for SaaS?

I'm working on a B2B SaaS app (rails) and it seems like there's an overwhelming number of options -- KISSMetrics, MixPanel, HubSpot, Clicky, Chartbeat, Hummingbird, A/Bingo, CrazyEgg, Optimizely, even good ol' Google Analytics.

Has anyone figured out a good working set of tools that pair well and don't lead to bits of the user experience across many different platforms?

Where does all the talk about these different services happen? (irc, forums, blogs, etc.)