I have seen the Tasman Green in my dealers showroom and it looked pretty good. Color is a personal thing, thats why there are so many color choices, but to me the "rare" equates to "dated" . . . . the F10 body style may be around for the next 7 years or so but some colors are only for 1 or 2 model years. I tend to take a traditional (boring) approach to colors, white, silver or black, it makes the model year a little less obvious to pick out.
My Alpine White F10 550 with Black Nappa leather is currently in route.