Need a good, inexpensive infrastructure monitoring app

I'm looking to set up a infrastructure monitoring system for our small/mid sized Microsoft environment (6 web servers, 6 SQL servers, a few app servers, 1 exchange...).  I would like to see network monitoring, server health (drive space alerts, snmp traps, etc) as well as application health (IIS, SQL).  Have been looking at commercial apps like WhatsUp Gold, but wanted to see if anyone had any recommendations before I buy.  I know there are a few free apps, and I may be willing to settle in order to save thousand$...

Any advice would be appreciated.  Note, will prob have to split up points as this isn't quite a right/wrong question...
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Here is free tool and very good

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Actually you pay for the programming,  the companies do for you inorder to get a good/understandable/easy  GUI which you can use. Every monitoring tool in this world has got the same basic principle.

If you don't mind paying some few bucks to any friend you know who can do a little bit of perl scripting, you can check on nagios. It's free. I know companies who is doing multi million dollar business based on Nagios, after customising it through scripting.

So you can guess, how powerful this free tool is.

May be this won't help you, but just an insight.

More $$$, more productivity, specially in the field of monitoring.


go with Solarwinds and NetQos
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