I had Saris's pedals at one point -- the PowerTap with sensors on both sides. I thought it would be interesting to see power balance, right vs left, and all the other metrics. It was for the first three rides. But it turns out it's 50/50, and I would suspect that's the case for almost all or most riders. When you see someone running, I never notice one leg launching them farther ahead with each stride than the other. The human body is a thing of balance.
So, you might look into their pedal with one power sensor. I think it works better anyway. My main beef with the PowerTap pedals is that (this was maybe 3-4 years ago, so it might have changed) one pedal sent its info over to the other, and then that one relayed it to the head unit. It was a little glitchy. One pedal and one signal probably would clean that up.
I went back to a Stages powermeter, which has been super reliable, not expensive, and very nice all around. You said that's not an option; if it were, I'd recommend it.