Psychology - But I would choose that because I'm a biased student of the social sciences </post-modernism>

Criminology has always sounded interesting to me.

Media Studies sounds fun, Psychology sounds boring to me blah blah blah.

If you want a job eventually, then any of them except Media Studies
There's a new TV ad campaign to get more people to be social workers, but I'd imagine hat would be a very stressful job. Psychology would be interesting, and it's a good point to go from for several careers.

... How the hell should I know?!