Hi yeh I looked at these too, and they look great. The only down side for me is they are in Oz and I'm impatient and in the UK! Have you looked here
http://www.milinst.com/ they are based in Leeds, West Yorkshire, UK and do loads of DMX boards from 1 switch relay, 8 TTL outputs, 8 relays, PWM/stepper board, servo, dimmer etc Ideal for laser projectors!
Hopefully gonna buy a couple of these babies for my next project! Hey f any of you do buy them let em know who told you about em. Cheers!
http://www.milinst.com/DMX/1_497s.jpg