Vader T..
I think there's not many 6868's out there because... there's really no reason why you shouldn't go straight to a 70GTQ. 6868 is a 68GTQ. By going to a 6868 vs 6776/6765, you've already given up spool up because of the bigger exhaust wheel. So... going with the 6868 is almost pointless because it will spool similar to the 70gtq but not make as much power.
If you have a combo to warrant going beyond the 6765, than a 70GTQ is then warranted. They do make a 67GTQ too that would be an in-between. If you trully just wanted to run 9.9x and not any faster, then a 67GTQ is probably the best turbo under that curve.