I like my ebony black, no light streaks.
Yes the Macassar has a reputation for light streaks, but some is totally black, like the Boys knife on the left in this photo. The Barlow on the right is Gabon Ebony, which can also have light streaks, though mine does not.
http://en.wikipedia.org/wiki/Ebony
Diospyros crassiflora (Gaboon ebony), native to western Africa;
Diospyros celebica (Makassar ebony), native to Indonesia and prized for its luxuriant, multi-colored wood grain.
btw, it is open to question whether either of those Ebonies are stabilized, my bet is they are not. The Boys Knife scales soaked up a lot of mineral oil and got noticeably darker afterward. But when I asked GEC if their Macassar is stabilized, they gave a generic answer "all our wood is stabilized".
For those who have not yet delved into the meaning of stabilized, it means soaked in Acrylic, plastic. GEC also said all their Bone is stabilized, in house.