Hey man, I aint to savvy on this whole ordeal but here is some tables to run off for FFXIV
For GFX Cards and their effects on the game.http://www.ffxivcore.com/wiki/Graphics_Card_Matrix
For Processors and their effects on the game.http://www.ffxivcore.com/wiki/Processor_Matrix
You can look at these, determine where on the Tier you want to go. The closer to 1 the better the game will run. It will also give you info to see whats the cheapest components for the tier you want to aim for.
Hope it helps man.