I like the style guide the best. The toy has just a little too much going on (though I think the removal of the helmet will probably fix a lot of that) and the Filmation version...um...well, she just shoved some paper through the choker she's wearing and it sticks up on either side of her head. Goofy, to say the least.
The style guid has the most interesting and simple look. I like the wings on the side of her head, and the tiara gets across the style of the helmet without making the head bascially immoble. I also think the net hangs much better on the style guide version than on the toy art, though the armor on the toy might make a cool removeable, optional item.