Voting 99 because all my SJ are lvl 49 and I'm too lazy to lvl them up 1 time.
Seriously though, 99. As said earlier, RDM does not need any more kicks to the nuts. I'm sure they would grant Composure to any job subbing RDM rather than main RDM only, which shows tons of bias towards other jobs (NIN and WHM) for not giving their abilities as a SJ.
If SE could work out some balance between what abilities should be granted and what abilities are main job exclusive, then I wouldn't mind 100 cap. However, my faith in that has been reduced quite a bit over the past year, so I am sticking with 99.