I've formed the opinion that all Vinifera red can be successfully blended. Some combos will be better than others, but all work.
So far, the typical Bordeaux base wines (Cabernet Sauvignon, Merlot) work with a variety of other reds blended in. Same for Rhone (Grenache, Syrah). I haven't had the chance to play with Italian varietals yet, although this fall I'll be blending Tempranillo with Rhone varietals (Mourvedre, Petite Sirah, Syrah). Early bench testing of Grenache with that blend was seriously wow.
Regarding yeast strains, I haven't done enough to form any patterns. Current wines (Grenache, Tempranillo) were each fermented in 2 batches, using RC-212 and Renaissance Avante, then blended back. I'm satisfied with both varietals, although they are young.
This is an area to research. I read the descriptions of the strains and choose them for what sounds good. You can't really go wrong.