Most valuable network managment tool for solution providers

There are so many opionts out there for proactive network monitoring for solution providers.  I would like to start a discussion on the pros and cons of each.

LPI - Managed Workplace / Silverbow / Kaseya / Infotech / N-able / Silverpeak / …………..

Lets discuss it?

Tags: infotech zenith, lpi, Managed workplace, n-able, network and systems monitoring, proactive network maintenence, silverbow, silverpeak, Solution provder tools