Well, I don't think you need a better camera; it's all in the operator. I Like #5 the best. The others aren't bad, I just think the exposure could be cranked down just a little bit. (but thats just my opinion) Photoshop/Lightroom can easily fix that.

If you're new at the game and you're already using photoshop/lightroom, start shooting in raw if you haven't done so. It's hard to explain why shooting in raw is awesome until you try it yourself.