I would also argue for quantity. Better to have a whole bunch in 2 styles than a few of 4 or 5 or 6 styles. Why?
I rarely have any get togethers that require more than eight stems. But if I buy a pattern, I get 36 +. This is at least four times the number I expect to use in one night.
Otherwise, it's not long till i've broken enough that I no longer have a matched set for company. If you are like me and buy at Costco or look for sales, you may no longer be able to find that pattern for a good price or at all. Of course, if you pay retail for Reidel, you don't have to worry about this problem - nothing wrong with that.
Re your question: I am skeptical of the Reidel claims that their precise shapes are ideally matched for each of their varietal/stylistic categories. Just one point: the sensory variation among representatives of a single varietal is huge, even if you consider just the excellent examples.
So, I say get two styles of glasses to start with, or (as said above) three if you like Pinot's. Later, if you have room and you are into it, you can get more styles as a splurge.