Rob,
My former job was consulting and my primary focus was with proactive server monitoring. I've personally implemented 4 locations with MOM2k & multiples of NetIQ AppManager. Microsoft even flew me to Redmond to be one of the first 50 people trained on this product. Microsoft bought the code from NetIQ a couple of years ago to make MOM. They have created a very complex product since. My only complaint, and why I seriously recommend NetIQ over MOM, is that with the MOM product by defaultALL possible alerts / event watchers are activated. This causes some SERIOUS event storms on your network. On average I've seen on as little as 10 servers 75K events per day, with MOM2K SP1! You can pare this back, but it is a very long process.NetIQ on the other hand, only alerts on the events that you tell it to look out for. These can be grouped type of events so your not haveing to input each one individually. Which makes it a lot nicer to administrate, and a lot less time involved maintaining the management of the system:-)
Either choice is well worth the work and peace of mind having early warnings of problems, and many problems can be self-healing with the proper fore-thought.
Good luck,
Rex