Which is better? Blackberry Bold* or Curve*? WHY?

Help, answer which one is best? cus i want a blackberry for my bd that was on tuesday, and my dad gonna take me on saturday! Oh onw more thing, i want UNLIMITED TEXT AND MAYBE* IF CAN* INTERNET<-- FOR LOW MONTHLY PAYMENT<- <- How do i get that or what do i do, or what company should i use?