If you already have the Volcano, I'd get the rubber clad for a little more variety and wearing versatility.
I like the Safari, and the Navy has its fans (too blue for my personal taste) but too similar to the Volcano (except for different dial colors) in my personal opinion.
If you had several and like the color variety, go for it, in which case I'd get the Safari, but if you will only have two, I'd get the rubberclad.
Cheers, and let us know what you decide!
TM