Okay well you def have enough money.
Blackberry curve 9360- is free with contract and discounts that are applied.
canceling your contract with the iphone will be about 150 or over depending on what company you have. If you have att , you will be paying about 300+
and depending on what plan you get it will be around 50.00 since that phone is from tmobile!
and warranty depends on where you buy the phone or you can get insurance for about 5.00 a month! good luck