All of the links below are DIY combos from newegg. They come with everthing you need but software. And all will be more than you need for FFXI!

http://www.newegg.com/Product/ComboB...t=Combo.827606
http://www.newegg.com/Product/ComboB...t=Combo.791304
http://www.newegg.com/Product/ComboB...t=Combo.827614

And they are all below your budget!