I know quite a few people with Explorers and GMT's, they're nice, no doubt, but I get the vibe that many owners buy them because they're a Rolex, not because they're a nice watch that meets their needs.
The Seamaster, to me, seems to be a touch more unique despite the lower cost than a Rolex. The Speedmaster is sorta unique in some senses but it screams watch guys watch, not status symbol or what have you.