I find myself wanting to hunt for a pair of Zeros. My gut tells me the Sub or 0.6 are going to be what I want to go after, just from looking at pics and seeing them appear to be bigger pairs. What pairs are most common (looks like 0.4, new and old, from ebay)? What sorts of things should I look for? Stems, generation differences, etc. Are all of the pairs similar in size, or do they increase with number, or does it really depend frame to frame? What does the 'p' suffix signify, as well as the numbers and letters on different Sub-Zeros, such as N2T? I've looked on O-Review and while they have a list of the retail pairs there's not a vast encyclopedia and limited pics available.