I suggest you clean it up some before you make a decision on antialiasing. It has a lot of areas where lines vary in width and have extra corner pixels. Removing a lot of those should make it look quit a bit cleaner without AA. Problem spots for that include the shadow and outline of the central element and the top and bottom of the first inner circle. You also have some noisy-looking pixels in the shadows and the leftmost lit area. They're giving you a grainy effect that clashes with the large areas of solid color.