Well I guess that really depends what you want to get out of Vana.
An RDM will ALWAYS be in demand unless you see a massive influx of BRDs which I don't see happening any time soon. However post 41 get ready to hear {Refresh}{Please} over and over and over. :-b
DRK and MNK have trouble getting PT invites post 50 so make sure you have some patience and the desire to be the best one out there. :-b However, I love BOTH jobs and have leveled both and will continue to do so. (DRG fits in this category but I'm only level 4 so I can't really comment on it that much)
WAR is kind of tricky. For the less experienced PTs you will be tanking (or when there is no NIN or PLD). For the more proficient pts you will be DD. Make sure to have equip for both. Well, at least food and weapons for both.
BLM? Nuke nuke nuke. If you know how to MB and what mobs are weak to what, well, that's about all you need to know. Now post 51, get ready for some more complicated macros involving elemental staff swapping. BLM is overlooked, IMO, as one of the most expensive jobs in the game. You don't get your money back with a spell once you get to the next level, and you need pies/juice pre-refresh (well pies always :-b). Nevertheless, very powerful, and very in demand.
WHM, well, it's rare you'll go long without a party. You'll be able to make money with teles. It just depends what you want to do. If you like to hold the lives of 5 others in your hands at all times, you'll like WHM. LoL.
BST, solo solo solo... duo duo duo. :-b Interesting job unless you are all about socializing. BST can be very misunderstood in a PT environment.
THF is GREAT for looking towards potential income. TH, TH2, lockpicking, flee, all great for helping to build up some money. THFs are also now HUGE for building a power party post 30. SATA Viper Bite in the hands of an apt user is VERY powerful. THFs with SATA are also a NIN tanks best friend. :-)
If you opt for SMN, PLEASE get your avatars and cap your skill. :-b
Ok looking at race, you are BEST suited in a DD role or even a tank. You are not bound to this by any means, it's just what fits the race best. Elvaan have the highest STR end game of any race so keep that in mind. We, unfortunately, have HORRIBLE ACC. :-/. This will be your biggest hurdle if you decide to go DD.
All in all, it comes down to what YOU want to do. What I see as a great job might be boring to you. I absolutely love my MNK and THF. The thought of leveling my WHM to sub for MNK for HNMs is very unappealing to me, but I'll do it regardless. However, there are some that LOVE WHM. More power to them. :-b. My suggestion, take some time and look at all the jobs here on Alla and maybe even read the job forums. Find what you like the best and go for it. Good luck!