For the less informed. Final Fantasy 14 is a very CPU/GPU/Ram intensive game. So you will need a decent computer before even considering buying this.
Basically the game demands a decent mid/high end processor such as a core i3 to core i7, or an equivlant in AMD such as a phenom or a quad core. Quad cores and high end dual cores are a must with this game, I can not stress enough. If you have a cheap processor thats years old you won't have much joy with this game.
That being said. Core 2 quad processors/AMD Athlon x4s should do fine for this game.
Then according to the back of the box you need a decent 100 pound plus graphics card with at least 512mb of Video Memory, you could get away with slightly less, but a high end Nvidia or ATI card is a must. Again if you're going midrange with your graphics card. Tone it down. Midrange cards will buckle with this game on high detail.
Game demands as much ram as you can throw at it, paired with a decent enough card. So if you have 1 or 2gbs of ram I wouldn't bother. Anything like 3 - 4gbs and above. Wonderful.
All in all this is a great game. Will end up being supported from start to finish. May not have everything everyone wants at the start, but what does? Could of used more time in Beta, Probably.
Hope this is somewhat helpful. Using the back of the box as a reference. Believe me when I say this game demands a decent PC. Do not be surprised if your 3 year old plus machine or laptop cant play the game. Infact if you have a laptop, I wouldnt bother buying this. You won't get a super smooth experience.