I believe there are too many alternatives and it is just a matter of what exactly are you searching for in an analytics tool and what are your needs. People actually looking for different kinds of metrics when using analytics tools.
http://www.woopra.com is a great tool but their pricing is a bit high for the amount of events you described in your question. They also include analytics for web.
http://www.kilometer.io looks very promising as it targets to analytics for startups and aims to be very simple. Event based analytics such as this are really the best ones.
What are the current problems you are having with MixPanel?