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

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