Lol, howcome her new short hairstyle ins't included? That one's my fav because it gives off a Tiffany vibe. <3
Regardless though, Nicole looks great with any hairstyle and my fav out of those 5 would be Style 2. =)
In my opinion, I think the first going off solo would be Nicole.
She has the voice, looks and the persona. She's already getting lots of exposure on various variety shows too.
Though, I wouldn't want Kara to split up for good. xD