If you want, take 5.
I would take English literature, as it is a well respected subject and I think that most people who take it enjoy it, even if it is hard work!
If you want to do psychology at university, don't think you need to take psychology at AS/A level, but I think it would be best to do so. Most people I know who take it enjoy it, but they severly underestimated the workload. Don't make that mistake.
I don't really see what economics has to do with your other subjects, or your prospective university subject. However, it is an interesting subject, and arguably quite useful in the current economic situation.
Just because you're interested in biology doesn't mean you'll like it at A level. Biology is a very broad subject. I thought I liked biology, but the topics at A level are of little interest to me. I like biochemistry and genetics, but there is minimal biochemistry and the genetics isn't very thorough. It isn't a difficult subject (for a science) but there is an awful lot to remember. Since November, I've been getting Ds and below because I haven't been making an effort. I know I can get a high A, but I still haven't started revision and just the thought of all the terminology I need to recall makes me want to **** myself. However, it does go well with the biological aspects of psychology, and is a useful subject for university admissions for psychology courses.
RS is the one subject here I have no knowledge of. From what I've seen on here, there are many different forms of RS, from religion specific to pure ethics. If I were you, I'd rule this one out and decide between biology and economics.
If you want very personal opinions, then here is mine:
AS: English literature, history, psychology, biology.
A2: English literature, history, psychology.
I hope this helps!
Oh ****, you wanted to know about law too. Well, English literature and history are the main two for law I think, and they like essay based subjects, as well as logical subjects. Economics would be good here! Although, I would highly suggest maths. Why don't you want to take maths, or haven't you thought about it?
I think replacing AS biology with maths would be a good idea, and then taking it to A2 in place of psychology.
Then again, you don't need to think about A2s for a while yet.