Well, I went ahead and test rode the 7.4 disc, and the difference in road feel and comfort from the non-disc carbon-fork version was dramatic. I also (non-scientifically) estimated the weight difference at about 2 pounds heavier for the disc/non-carbon fork.
For my purposes, the carbon fork comfort and weight difference far outweigh having disc brakes, so I have answered my own dilemma here. I will just have to wait for the non-disc version to hit my local LBS. Unfortunately, this won't be for about another 2 months.