After searching around for recommendations, I landed on Crucial instead of the Corsair and here's why:
1. Apparently 1.35V memory comes standard in the iMac from Apple. I have been reading that 1.35V produces less heat and requires less power than the 1.5V. Maybe this is paranoia, but I just can't see the difference in CL worth the voltage increase - See next point.
2. Comparing the CL10 vs CL11, I have not seen anyone claim a performance benefit.
3. Technically, the crucial vengeance ram is not a "Mac Recommended" Ram, unlike the Crucial or OWC memory.
4. Generally any performance benefits don't exist between the two choices, so I opted to choose stability vs. unknown.
If anyone has any other feedback I welcome it.