Good contributions, everyone, thank you.
I understand that Panasonic's North Carolina plant is almost certainly the manufacturer of Panasonic, BatteryStation, Streamlight, Surefire, Rayovac, and probably Duracell as well. Add in the comment about statistical sample size of the test data being so small as to likely have little to no statistical significance.
All that considered together, and it seems reasonable to conclude that battery performance probably doesn't differ significantly, if at all, taken in total, between choosing Panasonic, Duracell, BatteryStation, Surefire, Streamlight, or Rayovac. I think it does make good sense to buy from a few different lots and two or three different brandings just to reduce the possibility of having a problem with the entire stash... given, of course, the awareness and critical importance of proper matching when using two or more CR123s together.
Also, battery retailers commonly used by CPFers will provide expiry dating on cells they are currently shipping, if you ask for it. Not a bad idea so there are no surprises when you open the box. :sick2:
In shopping various sources it looks to me that the lowest prices for cells in the quantity of a dozen or so tend to be for BatteryStation ($1.25) and Rayovac ($1.35) with Panasonic a hair more @ $1.45. I need to remind myself that a 10¢ difference on each of 12 cells is a whopping $1.20!
If buying 24 of one brand, the price drops a tiny bit (like 60¢ for the whole order! :thinking
, but not really enough to make much difference to most people. From what I've seen, Surefire have been priced a little bit higher, with Duracel quite a bit higher. Shipping charges from one supplier vs. another can make a bit of difference as well with these small (24 cell) quantities. As Kestrell mentioned, if you can mix the cells into a larger order which will qualify for free shipping, that's all the better (if you're going to buy the other stuff anyway!) For me, a price difference of $1.20 or even as much as $5 or more for 24 cells is insignificant when considering the importance of long term reliability of cells which might be needed in an emergency.
I hope this exercise may be of help to others here now or down the road. I know it helped me sort things out quite a bit.