I purchased the servo/relay controller from here:
http://www.lynxmotion.com/Category.aspx?CategoryID=52
The relay board I assembled myself, It's a kit from Vellemen. Kit # K6714-16 from here:
http://www.electronics123.com/s.nl;...e3eSc38TaNqNe34Pa38Ta38LbN90?sc=8&category=36
I try to find them on ebay for cheaper.
As far as the usb to DMX, I use the Vellemen USB CONTROLLED DMX INTERFACE VM116 from here also:
http://www.electronics123.com/s.nl?sc=8&category=36&search=DMX
The Relay/Dimmer from chauvet is the DMX-4 which I buy off ebay. You can go to here to see specifics:
http://www.chauvetlighting.com/fixtures/dimmerrelaypack_fix.shtml
I also use these lights controlled by VSA:
http://www.chauvetlighting.com/fixtures/colorsplashjr_fix.shtml
http://www.chauvetlighting.com/fixtures/ledtechstrobeuv_fix.shtml
I run the VSA program, on the first set of channels are reserved for servo control for the animated skulls. I use different boards, like EFX-tek, pico pic, mini-ssc, just depends on what I'm putting out.
The the second set of channels run my Velleman USB controlled DMX 512 interface which goes out to a chauvet DMX-4 relay/dimmer, 4 colorsplash jr and led shadow.
The last remaining channel's run the Lynxmotion's SSC-32, it can be used to run servo's or controll relay's. I use it to control the 2 Velleman 16 relay boards for prop control and various function's. The SSC-32 is close to the computer and the cat5 runs out the house to the relay board's about 30 feet outside, then hard wired extrention cord's go the rest of the way.
I also use this setup to run my christmas lights and works great!
Any other questions just ask away!