Getting someone to buy you something can result in mistakes with brands/colours/etc., therefore you should just ask for sufficient money to buy what you want yourself.
Your parents shell out moeny for you on you bday like this and chrismas? I see why so many say the econemy are hitting them hard, but they ignore the reasons why they are.
If you were really given free reign to pick whatever you like, I personally would ask for a workshop of some sort. Somewhere where you could do what you like. Plus, space is the gift that keeps on giving. It can be filled with items such as: pool table, table tennis table, chill-out/music area and many more.
Ask for all of Jack Johnson's cd's and then when people see how mellow you are because you listen to Jack Johnson, they will be more willing to give you stuff.
