I'm looking to purchase some good network monitoring tools that will give me the best bang for my buck. I'm currently evaluated, Link Analyst, Observer Infrastructure, Observer Suite, and 3com network supervisor. Do you know of any other products that I can download and do an evaluation on that you like? I’d like to stay away from shareware unless it is very well done.
http://www.manageengine.com/
http://www.solarwinds.com/products/ipmonitor/ (or Orion)
For open-source, Nagios and Zenoss are pretty solid candidates