I've got an 8800 GT, C2D 2.13 GHz (E6400) and 4 GB of RAM.
Score is 2030 on low. Never drops below 25 fps, so I'm very bothered by it. I plan on OCing this CPU when I get a better cooler (or just switch to an E8400 or a quadcore), and get a better video card (probably a 5850 or 5870) sometime this fall.
I'd also argue that the amount of RAM is the least important for FF14 performance, as long as it's 3 GB or more. I'm not using more than 3 GB of physical RAM when I play games (or run the alpha client). Of course, I see the point in having a lot of RAM, but it's definitely not something FF14 is going to benefit greatly from. If you wanted better FF14 performance, you're better off spending more money on the CPU and graphics card, not getting 12 GB or more RAM.