This is an update to my earlier post: In pursuit of a monitoring solution for CentOS Linux
Based on some testing for the past couple weeks, the winner, or rather winners turned out to be Nagios and Zabbix.
Nagios was a great monitoring solution and was highly customizable and the plugins were simple to modify.
Zabbix is a lot more complex, but offers very nifty graphs for analysis. Graphs are always good ;)
Future posts will have the Nagios and Zabbix installation instructions for CentOS5.x - both the Client and the Server.