Do you absolutely have to have Motorcraft? If not, then just see what your parts store has.
My parts store generally has a few different options- usually a 1 year, 3 year, or lifetime warranty. For something like a cap and rotor they usually only offer a 1 or 3 year warranty, and I go with the 3 because that's long enough to cover it until I replace it again.
See what else your store can offer you in terms of warranty and cost and make your decision based on what you need. Personally I don't get hung up on name brands when it comes to basic tune up parts- as long as there's a warranty on them that's all I need.
You only need a distributor cap that has aluminum posts on it. The best distributor cap would have pure copper posts because copper conducts electricity far better than aluminum, but this does not hold true for brass (an alloy of copper). Brass is in fact less conductive than aluminum but only by a small margin when compared to the conductive difference between brass or aluminum to pure copper. Though the brass lugs do look better than the aluminum, it just doesnt stack up conductively.
I've seen cheap cap/rotors look worse with 15K miles than factory originals with well over 100K.
I currently have an MSD set on my 95 and it's holding up well with ~85K on it. It actually cost less than the parts store brand which I've had trouble with. I'll probably replace them in the near future. I think I'll go with Motorcraft this time though.