Based on the information provided I would estimate somewhere between $0.05 and $30,000,000 give or take a few based on unforeseen implementation costs.
My Pittsburgh experience shows that Zabbix is worth checking out
http://www.zabbix.com/product/
add Grafana for custom charting and dashboards:
http://play.grafana-zabbix.org/dashboard/db/grafana-zabbix-demo
I would strongly recommend that you perform a Proof of Concept…
I find the ability to find anomalous or unusual behavior is frustrating. The built in charts art quite old and there is only a few features such as 95th percentile to try to statistically look at the data. If you are collecting any amount of data, surfing through becomes a…