well it was revisions right?
DX 9c, we went through a b ...each had pretty good benefits over the previous:) From what I remember.
Why not jump into a new dx if its going to improve a little of both? would you rather have them call it dx 10c?
DX 10 = 9.a
DX 10.1 = 9.b
DX 11 = 9.c