I'm looking to buy either another 8GB or 16GB of RAM to add to the 8GB my iMac came with and am a little unclear on specs. I have seen posts about people completely replacing the stock RAM and putting faster memory in the computer. I have also seen posts about buying CL11 RAM rather than CL13. I was just going to purchase RAM from OWC as I know they are reputable, although I know they tend to be a little higher priced (I believe their RAM is CL11 and 1866 mhz). Crucial is a little less expensive, but is CL 13 rather than CL11. I know the benchmarks show that faster RAM and lower latency make the machine faster, but in day-to-day use is the difference noticeable? Is the OWC RAM a good bet?