I would like to experiment with live videos when I'm playing as a DJ. I'm a windows user but I can migrate to GNU/Linux and I have money to spend on software.

I remember trying Virtual DJ's video capabilities, but I wanted to know if there are alternatives.

Also, I also remember watching a presentation on QUARTZ which is a Macintosh exclusive software for manipulating video live with complete midi control - he even explained how to hook a WiiMote to the software

So my question is: What are the options for manipulating video live?