I have shied away from FX in the past because of resource usage and stuck with IconX when I wanted huge icons on my desktop. I don't know if things have changed or not with FX. Also, I believe that IconX gives you more options when setting desktop icons, since you can set specific settings for all four states of an icon and it's label...normal, mouseover, selected, selected and mouseover. If you are also using DesktopX, I'd probably go with IconX since the configuration of it is within the same menu.