I've voted for Nick but I can't stand Jade at this point. She seems to be monopolising him at the moment. She even said she thought she would perhaps only have an affinity for one or maybe two people in the house and he is it. She fully intends to try to keep him to herself so I think he needs to break away before she ruins his experience. By the looks of things, he has already realised this.
I also like Chloe. There is far more to her than Harriet who I liked at first but who has proved herself to be a foul mouthed fishwife. Joel is funny and very dry and surprisingly, Aaron is growing on me. I didn't think I'd like his childish, attention seeking antics but I am now finding him quite amusing. It's still early days though and I'm likely to change my mind as time goes on.