The number of bytes in a sprited file can be smaller than the sum of the bytes of each file individually. So the best option might be to inline the sprite :)
edit:
oh, so i didn't fully grasp what your comment was saying. are you suggesting that you would use inline-image AND a sprite to put all the images into a sprite AND load that sprite inline with the css?
edit: oh, so i didn't fully grasp what your comment was saying. are you suggesting that you would use inline-image AND a sprite to put all the images into a sprite AND load that sprite inline with the css?