Would this computer run FFXIV very well?

[Abriael]

This is a common misconception now. That used to be the way to go...until everyone started doing it. Companies have long since realized this and dropped their prices on builds for the most part. You can find a pre-packaged deal with nearly exactly what you want far cheaper than buying parts individually and building it yourself. Not to mention it's more convenient.

Edit: I'm not saying one or the other will always be cheaper. I'm saying shop around with both methods since either one could be cheaper depending on what you're looking for. It's about 50/50.

Can't say I ever found pre-packaged deals that were more convenient than buying the parts (not saying they don't exist, but my experience points to the opposite), but again, that's not even the main point.

Unfortunately most pre-packaged computers tend to include (again, to my experience) a catch somewhere (they have to make a profit after all), like the aforementioned low quality power source or other underestimated components, or even refurbished parts sold as new.
It may be mostly personal preference, but I wouldn't trust a PC for which I can't see each component in a sealed box

I actually forgot another important point. The memory. They often label the memory they give you as "corsair or other major brand" and that's a major question mark. First of all they don't guarantee the brand of your memory (which isn't exactly secondary, since there's a wide gap in quality between different brands), and even between the same brand, say Corsair, there's a *major* difference between Corsair Dominator sticks and lower end sticks like Corsair Valueselect. So I would make sure to check with the retailer exactly what they're going to put on your PC. If they refuse to specify, then chose another retailer, because ValueSelect (or worse) is most probably what you're going to get.