Re:Nagios Might Work (Score 1)

In addition to rolling your own Nagios UI, there is Nagvis http://www.nagvis.org/ for Maps. I was using a much earlier version, but the latest versions look much easier to implement and very promising. I have also been known to use Cacti with Nagios watching the RRD files every few min so I can still get my performance monitoring while letting Cacti do all the work. I had Nagios check the Cacti RRDs because Nagios has better options for communicating events.