I need really good, but pretty easy to use special effect software to do the following things: Chroma Key Shattering Glass Mushroom cloud Fire and easy to do rendering.... I want to do all of that in a software that is easy to do... having seperate softwares doesnt bother me.
This may be what you are
This may be what you are looking for: http://fxhome.com/
Go with proven software
I personally have Adobe After Effects and love it. It isn't necessarily 'easy' but there is a huge amount of support online to help you through the learning stages. For example, on Videocopilot.net there are a bunch of awesome tutorials led by the 'After Effects Guru' Andrew Kramer. There is also a Basic Training section to bring you up to speed with all of the After Effects controls.