I'm changing to a new system for our light show, so up for grabs is a like-new Enttec USB PRO DMX interface. Details are here: http://www.enttec.com/index.php?main_menu=Products&pn=70304&show=description&name=dmxusbpro I've been using this for the last 12 months or so with Freestyler (freeware) for our LED par can's, and it has performed flawlessly. One of the local clubs uses this same setup for LED cans and moving head fixtures and has some pretty impressive programming, I just haven't spend the time to work with it. There's an extensive list of free and paid software with which you can use this interface on the Enttec site above. I have the 5 pin DMX version, but will include a 3pin adapter to use with more common XLR connectors. $100 shipped anywhere in US.