At your level you should go for your AF axe and save your money for either hauby or apollo's. The AF axe is pretty good can last all the way up to viking axe *level 48*. The quest is fairly easy and can be solo'd at your level.
I prefer the Balance buckler (it is cheaper).
As for subs /nin vs /whm it really depends on your playstyle. I am generally /whm for -na spells etc but having both for certain camps is great. I would save /nin for level 75 and questing.
Just my humble opinion.