What should I buy?

I've been refeeing for soccer for this last season and I made about $50 and then I found a check I thought I'd lost from Christmas that was $20 so I have $70 to spend. I thought since a have a bunch of spending money now it would be nice to treat myself - I was thinking either this Juicy Couture t-shirt I wanted or some perfume. If I buy the t-shirt my mom will pay $15 of it b/c we have a deal worked out that if I want expensive clothes, she'll pay what should would pay at Koh'ls and I pay the rest. But she pointed out I may get bored with the shirt within a year or so. What do you guys think I should get - the shirt of the perfume? (And for those of you who say perfume, could you suggest a good scent? I'm only 14 so I don't want anything too mature)