What phone should I buy?

I have a little dilemna. I am 14 years old and am looking for the perfect phone. I do not know which phone to buy. I have T-mobile so i am very limited to the phones i get to choose. I get to choose between some phones right now. There is the Samsung Memoir, the Samsung Behold, and The Blackberry Curve 8900. Right now though, I have the T-mobile Wing and hate how it is gigantic. So, any of these phones will do. But, i cannot choose. I think the Samsung Memoir is too pricey because it just came out. Then, the Samsung Behold and the Blackberry Curve 8900 is what is catching my eye right at this moment. Things i look for in a phone is texting, wi-fi, and computer syncing.(I can try to do without wi-fi) I also love music. So, which phone is better, the Samsung Behold or the Blackberry Curve 8900? And please do not suggest other phones please! Thanks!