Guys, appreciate the responses very much. I find this as a very difficult topic to put in words, but I'll try my best. I must add, that occasionally, I rate a certain collection of watches that are less desirable (in which I mean, less coveted by the masses) higher, than a collection of watches that are fairly/very desirable, but without a theme -- of course, my rating is subjected to my personal preference for 'themes'.
Something which I am quite shy to admit, is that I always liked the notion of grouping my watches in pairs. Like for example, if I own a PAM36, I'd perhaps like to add a PAM82 into the mix
Nevertheless, the replies made my day. Thanks for sharing.