I working on a project which requires for us to monitor and entire IT infrastructure. In terms of size, consider it enterprise. Past the servers, I do not yet know the quantities of appliances but consider the numbers to be in the enterprise range. The company consist of about 6000's employees in over 75 countries.
600 windows servers
1000 linux servers
Within our linux/windows servers, we want to monitor sql, applications and other software within the servers.
I've used nagios open source in the past. But here I am at a new company with a bigger budget. They currently have tons of tools ( some from solar winds) but I was asked if I can do some research on the single best IT infrastructure monitoring system for us to keep an eye on a single display panel and oversee all nodes and applications in our network.