RDM/NIN is so cool and fun, you at lest try it once its great fun.
RDM/BRD good too or BRD/RDM there lots of spell here to help the party ..

FFXI
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Xill you recently have been experiementing with Rdm/Nin. If you decide to go that path then getting all the En- spells is a must. Having Nin subbed you will be no doubt using the Duel Weild ability, in which you will be melee more often, having the En- will give you the elemental attacks. That alone wont be enough you will need to also know what En- Spell to cast depending on what you are fighting, and what day it is, such as Firesday, watersday, etc.. Rdm/Nin is great combo, and if you decide on that route, I would strongly suggest you do get every En- Spell.

As a general rule, you do want to get as much stuff and spells as you can. I mean, it can never hurt. Admittedly, it's really expensive with mages.

One thing to ask yourself is what do you want to be in the long run? I am assumeing you dont have a subjob yet (unless RDM is your sub?) If you go down the RDM/BLM or BLM/RDM route then the EN- spells will be a huge help. If you go down the BRD/RDM route, then the EN- spells will balance out your songs nicely (if I can get the stupid keys and get to 30, I really want to try this combo out).

Also, one thing I learned the hard way, once you get to Qufim, either be a spell caster OR a melee. DONT TRY TO MIX IT UP! Otherwise, you draw way to much hate and will get slaughtered ;-)