Originally Posted by Wurm
As j-jr and others said, the Vigor's and Eurus will be plenty stiff, and I might add to that the Zonda's and Elan's too. I own '03 Zonda's, (same aero spokes as Eurus' and are lighter than new Zonda's) and a very fit cycling friend of mine who races on occasion owns the Eurus', Vigor's, and Elan's. Neither of us have any gripes about them.
I think people get ridiculous about the "stiffness" thing - whether it's wheels or anything else on the bike. At some point, you have to get over the psyche-out and get on with putting the miles in.
As for mixed wheelsets, there might be something to that idea, and I've often thought about trying it just as a lark.
You might be right about the stiffness. I don't have all that much experience with high-end wheels. I know that my wheels now are pretty flexy (The rear wheel rubs the brake pads when I'm spriting up a hill. The wheel is setup properly too. True as can be and the spokes are properly tensioned.) and I want to get as far away from them as possible. From my understanding, stiffness is the best thing to look for in a wheel. This is more important than aerodynamics or weight (within reason). The stiffer the wheel, the better the power transfer.