you may have to lower FF XIV's settings, especially at 1080p.
from what i can gather, its a very demanding game. though most of the complaints i've seen come from the Beta benchmarking tool, i would still expect the game to be quite demanding at launch. unless they make some massive optimizations before then.
I hear you need a decent quad to get good frames. though thats from the Beta and i have no idea how much optimization it will see before release.
generally a 5850 and a Phenom II 955 have been getting recommended for FF XIV. I think that a 5770 would be fine for you though, especially if you are fine playing at 1280, btu i think the athlon may struggle a little.
Your card is fine for your resolution, though if you upgrade to 1920 x 1080 it will struggle. If you do seriously see yourself going for a higher resolution soon and feel the 5850 is too expensive, then at least get the GTX460, Overclocked it will handle games well at 1920 x 1080.
I've always been indifferent to either, until Nvidia released Fermi and I went strongly to the ATI side, but the GTX 460 is a nice card. For single card solutions I still say the 5850 as I consider this the weakest you want for 1920 x 1080, but the GTX460 is at least a decent cheaper alternative that can handle some games at HD resolution and overclocked can handle plenty
I'll admit I'm a complete ATI fanboy, but that Fermi 460 is SUCH A BEAST. It's now my go to GPU recommendation. Especially after seeing the SLI scaling, GOOD LORD.
while im Not a fanboy, i certainly had lost any interest in Nvidia this gen. and pretty much always recommended a 5 series card. but now just about every build i see im suggesting either one or two 460s. its a brilliant card, and it deserves the credit.
while i still love the 5 series cards, Nv have done the impossible and made pretty much a whole line of high end cards obsolete with a single release. Kudos to them.
As an AMD user the only thing that frustrates me is the AMD motherboard restriction for SLI, unless of course it has an nVidia chipset. Makes me jealous of Intel motherboards that are universal with dual video cards.