When I built my brewframe about a year ago, I used the McMaster-Carr brass disconnects.
I recently changed all my fittings over to the stainless steel Camlocks from ProFlow Dynamics. The camlocks have a larger interior diameter allowing greater flow rates. They do not react to any chemicals, are less expensive than the McMaster-Carr QDs and just look cooler
Here is my rig with the McMaster-Carr QDs:
Here it is about a year later with the Camlocks:
Here is a link to some more reviews (with better pictures) of the Camlocks