web server management software for windows server?

Hi, we have a web site needs a monitoring software can do the following thing:

able to send text message and email to the administrator for alerting
alert when a single website is offline
alert when the IIS service is stopped
alert when SQL database is offline
alert when the server is offline
alert when a specific bandwidth quota is exceed

I found some software can do these like whatsup gold, but they are way too pricey, I was wondering if there's any popular open source or cheaper monitoring software exist with less functions ?
btw, our server is windows 2008 standard
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SQL alerts http://www.mssqltips.com/tip.asp?tip=1523
IIS/website alerts http://www.internetvista.com/en/iis-monitoring.htm

If the server is offline you will soon find out by people trying to use it.

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Use the pingdom alert service, It is very cheap and very effective in server monitoring.

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Windows Server 2008

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