Best watch forum I have found so far is: forums.watchuseek.com/f2
The /f2 is for 'public forum' section, where all things related to watches get discussed. There are specific topic sections as well, but the public forum is much more entertaining.
Again, watchuseek however I spend the majority of my time on rolexforum. Obviously primarily a rolex forum but there is subsections for each other brand that are well enough traveled to keep me in place over there.