BeatHarness is the ultimate VJ.
It uses images, videos, live-camera input and scriptable(!) effects & transitions.
Use your own videos & images in the effects by copying them to the right directory !
Be warned though - extreme visuals need good hardware, so bring your latest ATI / NVIDIA gfx-card ;)
Best suited for loud music and big parties - techno/trance/hardcore will do :)
This is definitely one to give a go. There's even a funky 70's style coloured disco wall included which is a must have. Using normal style presets to image merged ones and other effects, this has a good range in midst of other heavy weight visualisation plugins out there. Only issue noticed was that the window gradually moved down the screen between opening/closing it otherwise there were no other problems.
Go on, give it a go and make sure to check the plugin's website!