I think there are even 8 land oceanics, but I could be wrong. I don`t know what each race should prefer, I`ve heard that it should depend on the race though. I tend to go with the U.Spazial though, since you don`t have to worry about clustering it, unlike the oceanic
Oh, and BONES, most of those are fairly useless on their own, I`d dig some more, especially during the peak dig times, so that you can get enough to put together some fairly useful artifacts, such as minor gordos.