Set some money aside for university (God knows I'll need it) so that I won't have to take out any student loans.
Buy all the music I want, I'll probably never run out of music to buy and an excellent audio set up with a good quality LP player, AV receiver and all the other bells and whistles. Get a private tutor to teach me French, German and Italian. Get me and my family the best private healthcare I can find. Get a nice flat in Central London while I'm studying and eventually settle down in Paris and run my own late night coffee house. I would buy a hybrid car while I'm still in the UK so I don't have to put up with Britain's obscenely useless public transport.
Of course I'd love to travel the world with Mr. Right which I doubt I'm alone on that one, although obviously there will be more danger of people only interested in you for your money.
A 3D TV, high-end PC, high speed broadband, a lossless audio set-up with 7.1 channel speakers, a Blackberry and a 64gb iPod Touch would all be pretty kewl, but not a priority.
There is obviously a lot of money I would spend on my family and on supporting various charities, but I won't go into it. Talking about money is vulgar enough without talking about how generous you think you are.