Well, just to be difficult, I like #3 the best. Nice work. Personally, I think the exposures are quite long enough - I find this blurred water stuff just done to death these days. Every contemporary English landscape and coastal photographer has to do the long exposure thing, and I'm just bored by it. Same with the inevitable waterfall shots, which everyone endlessly trots out.
The subject here and the compositions are strong. I don't think they need a gimmick to help them out. But that's just my opinion, and maybe I'm off message as usual
John