By now I'm sure you know that you can't have everything. So you need to decide whats more important to you, and if you have the gil, buy all the gear for all the situations.
I used Royal Squires Robe at that lvl for the +10mp, Rse Feet +12mp, and Rse Pants +32mp, because as rdm your always lacking mp and that should come as first priority imo. Without these 3 pieces of equiment which i think you should have by now (especially since you can get it now), your losing 54mp. This is a huge advantage for you to have and i couldn't imagine myself playing redmage to its fullest without it. And those feet and pants will last you even past AF, and alot even prefer them over AF, so as hard as it is to get, its worth it.
However... I hate the fact of running around jueno in a robe so buying armour for looks or farming helps with the ego a bit, but thats all that armour is really gonna do for you at this point. Now that I look back I farmed a hella lot to equip all that extra armour and I'm not sure i'd do it again.
The kind of gear you get really is determined by your sub and your role in the current party. If your required to be main healer, you'll need to also land slow, and paralyze pretty quick so you have more time to heal. Subbing whm and getting mind equipment would helps lots in this situation. If you have a whm, then you should participate in skill chains with your nukes, in this case sub blm, and get some int to help with the damage.