Nagios is very powerful and capable of doing almost anything that you want, but it is an eff-in' nightmare to configure and almost impossible to quickly add and

Nagios is very powerful and capable of doing almost anything that you want, but it is an eff-in' nightmare to configure and almost impossible to quickly add and remove things that you want to monitor. If your answer to my request to add a new monitor is "well, just open up the configuration file..." you've lost me already.