What is the top Network Management application out there?

[bobbyarrazate () nyms net]

What is the best Remote Management & Monitoring program available?
I Googled the web and discovered the following:
Kaseya.com
GFI.com
Logmein.com

They all look different... Does anyone has experience with any of them?
In addition had anyone hear of this:
<a href="http://n-able.com/";>N-able remote monitoring software</a> ?

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