As of now, I plan to level Blm and Thf to 99 first. Once I get my War to 75, I might also prioritize it to 99 quick like a bunny, since I already like it very much although it's still only a baby. Blm will probably be easiest and therefore first, I duo'd it all the way to 75 in a short time span with Rues's blm.
Rng was my first 75, and has been my only DD job for a long time. I much prefer War over Rng so far, though. So I might leave rng at 75 for awhile. Or forever. This new level cap will be awesome for getting out of jobs that you don't really like! ~.^
The bigger question for me is which sub to re-level first. Nin is already 41, so that's not too bad. Rdm is already gimped for my blm, which is very bad and rather unhelpful. So probably rdm first, then nin, dnc, and whm, then whatever I feel will be funnest or most useful after that.
Weeeee this will be fun! :D And no, that is not sarcasm. I am excited to see what will happen. ^^