I recently went through the process of evaluating new monitoring software for my company as well and which product you go with really depends on what your needs are. I have also worked with may of the products that you noted and they all have both their strengths.
If you aren't familiar with it OpenNMS really is a great product, I have used it for years, have attended the training offered by the OpenNMS Group, and also had the commercial support for it which was fantastic. Tarus and the rest of the guys with the OpenNMS group are all fantastic to work with and the community support is awesome as well. If you are used to working with OpenSource products and are familiar with RRD (which you likely are from using Cacti) then OpenNMS is absolutely worth a try.
If you have some budget to work with and you want a more commercial solution that is MS Windows based I would suggest you take a look at SolarWinds Orion. Orion has a great monitoring solution for a good price. SolarWinds also offers several modules for Orion for things such as high level application monitoring, VoIP monitoring, network device configuration management, IP address space management, etc.
Like I said, it all really comes down to your needs and where your personal comforts are.
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I recently went through the process of evaluating new monitoring software for my company as well and which product you go with really depends on what your needs are. I have also worked with may of the products that you noted and they all have both their strengths. If you aren't familiar with it OpenNMS really is a great product, I have used it for years, have attended the training offered by the OpenNMS Group, and also had the commercial support for it which was fantastic. Tarus and the rest of the guys with the OpenNMS group are all fantastic to work with and the community support is awesome as well. If you are used to working with OpenSource products and are familiar with RRD (which you likely are from using Cacti) then OpenNMS is absolutely worth a try. If you have some budget to work with and you want a more commercial solution that is MS Windows based I would suggest you take a look at SolarWinds Orion. Orion has a great monitoring solution for a good price. SolarWinds also offers several modules for Orion for things such as high level application monitoring, VoIP monitoring, network device configuration management, IP address space management, etc. Like I said, it all really comes down to your needs and where your personal comforts are.