Ask HN: Recommendations for mobile analytics product at scale?

We're now at scale and looking for a mobile analytics product that allows us to take a look at our funnels and user retention.

We have the following requirements: -We need to track about 200MM-400MM events/month. -Realtime retroactive funnels. I want to be able to make a query and get an answer back in less than 60 seconds. I also want to be able to add arbitrary key value pairs to each event and filter steps in the funnel based on the presence of a particular value. -We need to be able to apply filters on users to the funnel and retention graphs that we look at. We'd like to filter on standard things, such as country or device, as well as define our own user properties (eg by ad campaign or A/B test group).

Up to this point, we use Flurry and Apsalar, although we've found both to be inaccurate compared to numbers that we track internally. They're also annoying tools to use. We're happy to pay a few thousand dollars a month for this. Mixpanel (who offers the closest to what we want)/Kontagent cost an order of magnitude too much. I've also looked at Localytics, but after talking to a few current users of the platform, it seems rather simplistic and they don't have any advanced segmentation on the funnels.

Do you guys know of anything that fits the bill? We'd rather not have to think about building it in house.