Gotland's lovely, so silky and pretty. And felts while it's sitting waiting for you to finish spinning a bobbin-full - ask me how I know!
Shetland, of course, is lovely. Spins nicely, will felt if you try to do it, but not so much when you don't want it to. Lovely to knit with, including lace, can be woven with too.
You can get white Shetland, which would take dyes easily but actually, one of the pale greys or browns might give a more interesting, sophisticated look, something a bit different?