Need some cell Phone Advice

I went to the Cingular Store with the intent on getting a Nokia N75 they didn't have any in stock so They said It would come in today so I Paid for the phone but They gave me a Samsung BlackJack as a placeholder. I dont know whether to keep the BlackJack or get the N75. The N75 takes clearer pictures and I dont really need a PDA but the BlackJack has a longer battery life, a extra battery and the rebate is $50 more. I cant decide.