My 2 are 5 and 14 and i'm spending £250 on the 14yr old and about £150 - £200 on the 5yr old.
I would normally spend less on the younger one but she is having a tv and dvd for her bedroom which i consider a bit of an investment as i'm hoping it will last a good few years.
I find with older dc its getting increasingly difficult to spend less as everything they want is so expensive,on dd's list is an ipod touch and some vans.
I'm really interested nosy to see what everyone else spends and what you will be buying 