I like the "Cab Franc Off" that
@NorCal posted about, a simple evaluation of the effects of different treatments for the same batch of grapes. Hope it provides insight to his group and to us as observers about the effects of the different treatments on the ultimate outcome of the wine. Controlling a few variables in an otherwise highly variable process should give some good insight, and I look forward to hearing the results.
My opinion of the conversation that
@balatonwine brought up about the nomenclature of varietals is valid, and my opinion is in the same vein as his. Personally, I feel that if you give someone a bottle of wine and tell them that it's Cabernet Sauvignon, that it should be just that, Cabernet Sauvignon, period, nothing else, and I choose to label my wines as such. Something about the purity of it excites me, and I make, collect and enjoy a lot of wines in my cellar that are pure varietals.
Nonetheless, nomenclature and rules in winemaking have been given a place in society in an attempt to try to create some consistency and order, and as long as you understand what you're dealing with, to me, it's immaterial. Were I king for a day, there would be another category in wine judging, including one for pure varietals with no other grapes blended in. I might even rule that if it's a pure Cab, you can call it Cabernet Sauvignon, if it's 75% + Cab that you can only call it a Cabernet Sauvignon Blend. But that's just my opinion.
That said, if one can increase the aroma, mouthfeel, body, complexity and enjoyment of a Cab by blending it with Petite Verdot and Merlot, I'm all about that too, and understand that if it's 75% + Cabernet Sauvignon, that it's still ok (by nomenclature standards) to call it a Cabernet Sauvignon. I'd prefer to drink the wine that tastes better, even if it's a blend. I have no problems at all collecting and enjoying wines that are called by a varietal name, yet have some other minor component varietals blended into them, and accept / understand what components are present when I make or buy them.