Errrm, with such budget I would advise you on getting this a Canon G9. They are fantastic Compact cameras and well worth the money. Or you could go for a second-hand G10, but personally I think that a brand new G9 would be just as good and a little bit lighter on your budget.
When you start the course, could you please write to me and let me know what the course is like, whether you are enjoying it etc. I am in Year 10, so in about 1 and a half years I will be going to 6th form and I am thinking of taking photography too.
Good Luck and thanks in advance!